# CADET Troubleshooting **URL:** https://forum.cadet-web.de/c/cadet-troubleshooting/13.md [Latest](https://forum.cadet-web.de/latest.md) · [Categories](https://forum.cadet-web.de/categories.md) · [Tags](https://forum.cadet-web.de/tags.md) --- ## [About the CADET Troubleshooting category](https://forum.cadet-web.de/t/about-the-cadet-troubleshooting-category/129)
**Author:** [@s.leweke](https://forum.cadet-web.de/u/s.leweke)\ **Replies:** 0\ **Last updated:** [July 10, 2020, 9:35am UTC](https://forum.cadet-web.de/t/about-the-cadet-troubleshooting-category/129 "2020-07-10T09:35:01Z")
Get help with problems related to CADET software (bugs, problems, crashes, etc.). --- ## [Issues with running PCC file with CADET-Process on the high power computer cluster (HPC)](https://forum.cadet-web.de/t/issues-with-running-pcc-file-with-cadet-process-on-the-high-power-computer-cluster-hpc/1431)
**Author:** [@Daniella](https://forum.cadet-web.de/u/Daniella)\ **Replies:** 7\ **Last updated:** [August 20, 2026, 2:56pm UTC](https://forum.cadet-web.de/t/issues-with-running-pcc-file-with-cadet-process-on-the-high-power-computer-cluster-hpc/1431 "2026-08-20T14:56:10Z")
I am doing an optimization on my PCC model with the goal of exploring the parameter while doing it. Here is the full PCC process for reference: I have noticed something with the stability of the model on the HPC, ca… --- ## [TypeError when using CADET-Match](https://forum.cadet-web.de/t/typeerror-when-using-cadet-match/1401)
**Author:** [@dmeier](https://forum.cadet-web.de/u/dmeier)\ **Replies:** 2\ **Last updated:** [April 20, 2026, 8:34am UTC](https://forum.cadet-web.de/t/typeerror-when-using-cadet-match/1401 "2026-04-20T08:34:08Z")
Dear Cadet Community, since this is my first post in the forum, I want to start by thanking the developers and users alike for creating such a place where vivid exchange about experiences with Cadet is possible. I alrea… --- ## [Using custom cadet core in Cadet-Process](https://forum.cadet-web.de/t/using-custom-cadet-core-in-cadet-process/1421)
**Author:** [@sasha\_onfleek1](https://forum.cadet-web.de/u/sasha_onfleek1)\ **Replies:** 5\ **Last updated:** [April 15, 2026, 2:45pm UTC](https://forum.cadet-web.de/t/using-custom-cadet-core-in-cadet-process/1421 "2026-04-15T14:45:59Z")
Expected behavior. Hello! Flynn shared with me his version of cadet core that was allowing him to run a two component simulation with the ACT isotherm. Since Im using cadet-process and hes using a more advanced version (… --- ## [Issues possibly related to PyPI metapackage installation (without conda)](https://forum.cadet-web.de/t/issues-possibly-related-to-pypi-metapackage-installation-without-conda/1408)
**Author:** [@ucbevng](https://forum.cadet-web.de/u/ucbevng)\ **Replies:** 10\ **Last updated:** [April 10, 2026, 2:34pm UTC](https://forum.cadet-web.de/t/issues-possibly-related-to-pypi-metapackage-installation-without-conda/1408 "2026-04-10T14:34:41Z")
Expected behavior. Repicating the codes from CADET-Workshop/02 CADET Fundamentals/02.1 first steps/02.1.1\_breakthrough.ipynb at solution · cadet/CADET-Workshop · GitHub Successful autodetection of CADET with “simulator… --- ## [Error when setting recording solid-phase conc in CADET-Process](https://forum.cadet-web.de/t/error-when-setting-recording-solid-phase-conc-in-cadet-process/1347)
**Author:** [@sov\_2024](https://forum.cadet-web.de/u/sov_2024)\ **Replies:** 4\ **Last updated:** [April 9, 2026, 5:35pm UTC](https://forum.cadet-web.de/t/error-when-setting-recording-solid-phase-conc-in-cadet-process/1347 "2026-04-09T17:35:49Z")
Hi, I’m running CADET-Process and trying to get solid-phase concentrations on the resin using the General Rate Model. However, when I set column.solution\_recorder.write\_solution\_solid = False column.solution\_recorder.… --- ## [Issues with GIEX fit and two comparators](https://forum.cadet-web.de/t/issues-with-giex-fit-and-two-comparators/1411)
**Author:** [@MoritzImendoerffer](https://forum.cadet-web.de/u/MoritzImendoerffer)\ **Replies:** 2\ **Last updated:** [March 23, 2026, 4:21pm UTC](https://forum.cadet-web.de/t/issues-with-giex-fit-and-two-comparators/1411 "2026-03-23T16:21:54Z")
Expected behavior. I can combine e.g. NRMSE and PeakPosition as metrics for the fit. Actual behavior When using peak position and NRMSE together, I get an error in reduction.py from PyMoo def \_do(self, random\_state=Non… --- ## [Protein A affinity PCC modelling](https://forum.cadet-web.de/t/protein-a-affinity-pcc-modelling/1345)
**Author:** [@naveen567](https://forum.cadet-web.de/u/naveen567)\ **Replies:** 6\ **Last updated:** [February 6, 2026, 9:21am UTC](https://forum.cadet-web.de/t/protein-a-affinity-pcc-modelling/1345 "2026-02-06T09:21:12Z")
Hi, I am working on modeling Protein A affinity PCC chromatography. Since I am not very familiar with SMB Builder, I tried using the scheduling method. Expected result: I was expecting a proper elution for different c… --- ## [Installing CADET](https://forum.cadet-web.de/t/installing-cadet/1376)
**Author:** [@ollie\_p](https://forum.cadet-web.de/u/ollie_p)\ **Replies:** 1\ **Last updated:** [February 5, 2026, 1:35pm UTC](https://forum.cadet-web.de/t/installing-cadet/1376 "2026-02-05T13:35:19Z")
Expected behavior. CADET installs and works. Actual behavior CADET returns an abundance of errors when running in VSCode jupyter notebooks or spyder python script. How to produce bug (including a minimal reproducible e… --- ## [Excluding components from the Fractionator (divide\_by\_zero error)](https://forum.cadet-web.de/t/excluding-components-from-the-fractionator-divide-by-zero-error/1330)
**Author:** [@101abhinav](https://forum.cadet-web.de/u/101abhinav)\ **Replies:** 3\ **Last updated:** [January 27, 2026, 12:06pm UTC](https://forum.cadet-web.de/t/excluding-components-from-the-fractionator-divide-by-zero-error/1330 "2026-01-27T12:06:03Z")
Expected behavior. Hi, I’m currently checking out the capabilities of the Fractionator object within CADET-Process. I’m working with a model where the first component is Salt, but it does not really make much sense to … --- ## [AttributeError: 'NoneType' object has no attribute '\_get\_values\_from\_container' (parameter fitting attempt)](https://forum.cadet-web.de/t/attributeerror-nonetype-object-has-no-attribute-get-values-from-container-parameter-fitting-attempt/1319)
**Author:** [@AN\_IA](https://forum.cadet-web.de/u/AN_IA)\ **Replies:** 5\ **Last updated:** [November 11, 2025, 4:02pm UTC](https://forum.cadet-web.de/t/attributeerror-nonetype-object-has-no-attribute-get-values-from-container-parameter-fitting-attempt/1319 "2025-11-11T16:02:13Z")
Expected behavior. Hello everyone, I have tried to implement parameter fitting into my model. I get this error message: (AttributeError: 'NoneType' object has no attribute '\_get\_values\_from\_container'). Expected beha… --- ## [Solver.nthreads not working in v5.0](https://forum.cadet-web.de/t/solver-nthreads-not-working-in-v5-0/1087)
**Author:** [@a.moser](https://forum.cadet-web.de/u/a.moser)\ **Replies:** 13\ **Last updated:** [October 31, 2025, 6:27am UTC](https://forum.cadet-web.de/t/solver-nthreads-not-working-in-v5-0/1087 "2025-10-31T06:27:32Z")
Hi All, We’ve noticed that it seems like the solver.nthreads variable isn’t actually changing the number of threads in v5.0. We saw this in CPU monitoring while running simulations in v4.4 vs v5.0. Is there a change th… --- ## [CADET installation issue mac M3](https://forum.cadet-web.de/t/cadet-installation-issue-mac-m3/1157)
**Author:** [@naveen567](https://forum.cadet-web.de/u/naveen567)\ **Replies:** 4\ **Last updated:** [September 19, 2025, 7:56am UTC](https://forum.cadet-web.de/t/cadet-installation-issue-mac-m3/1157 "2025-09-19T07:56:38Z")
Hi all, I attempted to install CADET-core through conda-forge but was unable to do so. When I tried using the Immudzen channel, I encountered an error when importing a cadet from cadet-process. I would appreciate your a… --- ## [Printing Solution for particle (how much adsorbed on the particle)](https://forum.cadet-web.de/t/printing-solution-for-particle-how-much-adsorbed-on-the-particle/1310)
**Author:** [@kautharmaalim](https://forum.cadet-web.de/u/kautharmaalim)\ **Replies:** 2\ **Last updated:** [September 10, 2025, 11:19am UTC](https://forum.cadet-web.de/t/printing-solution-for-particle-how-much-adsorbed-on-the-particle/1310 "2025-09-10T11:19:02Z")
Hi Cadet users, I want to print an array showing how much is bound across the column length. I used these lines of code to return data that I want to print # Return data model.root.input\['return'\].split\_components\_data… --- ## [CADET not found (new thread September 2025)](https://forum.cadet-web.de/t/cadet-not-found-new-thread-september-2025/1304)
**Author:** [@AN\_IA](https://forum.cadet-web.de/u/AN_IA)\ **Replies:** 3\ **Last updated:** [September 5, 2025, 6:48pm UTC](https://forum.cadet-web.de/t/cadet-not-found-new-thread-september-2025/1304 "2025-09-05T18:48:22Z")
Expected behavior. Hi everyone, as requested, I’m starting a new thread with my problem, which I first described in this thread: Expected behavior: (1) CADET should be able to reliably autodetect its own installati… --- ## [Cadet not found](https://forum.cadet-web.de/t/cadet-not-found/1063)
**Author:** [@akshayts](https://forum.cadet-web.de/u/akshayts)\ **Replies:** 6\ **Last updated:** [September 3, 2025, 12:24pm UTC](https://forum.cadet-web.de/t/cadet-not-found/1063 "2025-09-03T12:24:01Z")
Hi, I am fairly new to this platform. I have installed CADET-Process and Cadet on VisualStudio code. I am trying to run the CadetProcess simulator and when I run this command - from CADETProcess.simulator import Cadet … --- ## [LRM does not support bulk reactions](https://forum.cadet-web.de/t/lrm-does-not-support-bulk-reactions/1294)
**Author:** [@AN\_IA](https://forum.cadet-web.de/u/AN_IA)\ **Replies:** 2\ **Last updated:** [August 12, 2025, 7:33pm UTC](https://forum.cadet-web.de/t/lrm-does-not-support-bulk-reactions/1294 "2025-08-12T19:33:05Z")
Expected behavior. Hello, I am a bit confused by the behavior I get from CADET when trying to model a bulk reaction in the LRM. Looking at the mathematical model for LRM, I assume I should be able to specify a liquid (b… --- ## [Enquiry about add\_parameter\_sensitivity](https://forum.cadet-web.de/t/enquiry-about-add-parameter-sensitivity/1290)
**Author:** [@Yang](https://forum.cadet-web.de/u/Yang)\ **Replies:** 6\ **Last updated:** [August 8, 2025, 8:24am UTC](https://forum.cadet-web.de/t/enquiry-about-add-parameter-sensitivity/1290 "2025-08-08T08:24:13Z")
Hello all, I am trying to use the sensitivity analysis feature of cadet-process. Specifically, in my code, I would like to obtain the partial derivative of the concentration at the outlet of tube1 c\_out(L,t) with respec… --- ## [Help debugging GIEX](https://forum.cadet-web.de/t/help-debugging-giex/1284)
**Author:** [@moritz.imend](https://forum.cadet-web.de/u/moritz.imend)\ **Replies:** 1\ **Last updated:** [July 27, 2025, 8:24pm UTC](https://forum.cadet-web.de/t/help-debugging-giex/1284 "2025-07-27T20:24:05Z")
Expected behavior. Hi, I am trying to extend an example from SMA to GIEX using cadet process. I am running it on ubuntu 20.04, with cadet 3.04 (using conda) and Cadet Process as 0.11.1. I would expect the GIEX example t… --- ## [Error with DG discretization and EMPM binding model](https://forum.cadet-web.de/t/error-with-dg-discretization-and-empm-binding-model/1283)
**Author:** [@nbarry03](https://forum.cadet-web.de/u/nbarry03)\ **Replies:** 5\ **Last updated:** [July 22, 2025, 2:51pm UTC](https://forum.cadet-web.de/t/error-with-dg-discretization-and-empm-binding-model/1283 "2025-07-22T14:51:49Z")
Expected behavior. Using the DG build of CADET-Core and CADET-Process, SMB built with CarouselBuilder using ExtendedMobilePhaseModulator binding model and DiscontinuousGalerkin discretization runs successfully with float… --- ## [Batch Elution Chromatography Example](https://forum.cadet-web.de/t/batch-elution-chromatography-example/1281)
**Author:** [@sasha\_onfleek1](https://forum.cadet-web.de/u/sasha_onfleek1)\ **Replies:** 4\ **Last updated:** [July 22, 2025, 11:41am UTC](https://forum.cadet-web.de/t/batch-elution-chromatography-example/1281 "2025-07-22T11:41:26Z")
Expected behavior. Heelo! I am new to this and I’m trying to run the first example of CADET Process. I have created an environment (cadet\_env) where I have installed the cadet core and the cadet process (all through cond… --- ## [Colloidal isotherm hangs](https://forum.cadet-web.de/t/colloidal-isotherm-hangs/1273)
**Author:** [@rosario.cervellere](https://forum.cadet-web.de/u/rosario.cervellere)\ **Replies:** 4\ **Last updated:** [July 10, 2025, 6:55am UTC](https://forum.cadet-web.de/t/colloidal-isotherm-hangs/1273 "2025-07-10T06:55:47Z")
Expected behavior. Simulation finishes with no binding. Intent is to fit Bpp and ln(Ke) at individual pH breakthrough and washout, then create pH dependence. Actual behavior Simulation hangs How to produce bug (includi… --- ## [CADET Solution trying to return an array with two differently sized axises](https://forum.cadet-web.de/t/cadet-solution-trying-to-return-an-array-with-two-differently-sized-axises/1253)
**Author:** [@Daniella](https://forum.cadet-web.de/u/Daniella)\ **Replies:** 1\ **Last updated:** [June 27, 2025, 7:35am UTC](https://forum.cadet-web.de/t/cadet-solution-trying-to-return-an-array-with-two-differently-sized-axises/1253 "2025-06-27T07:35:47Z")
Expected behavior. I am trying to add a cstr into my periodic counter current chromatogram code to mimic the flow restrictor on the AKTA. I have a separate code to model a tracer run I did with the CSTR and that works fi… --- ## [write\_solution\_solid error with Spreading binding model](https://forum.cadet-web.de/t/write-solution-solid-error-with-spreading-binding-model/1251)
**Author:** [@elenabull](https://forum.cadet-web.de/u/elenabull)\ **Replies:** 1\ **Last updated:** [June 25, 2025, 3:56pm UTC](https://forum.cadet-web.de/t/write-solution-solid-error-with-spreading-binding-model/1251 "2025-06-25T15:56:10Z")
Expected behavior. I’m using the Spreading binding model in CADET-Process (version 0.11.1) and would like to output the solid-phase concentrations of the bound protein in orientation 1 (q1), in orientation 2 (q2), and th… --- ## [negative elution with Langmuir MPM](https://forum.cadet-web.de/t/negative-elution-with-langmuir-mpm/1235)
**Author:** [@rosario.cervellere](https://forum.cadet-web.de/u/rosario.cervellere)\ **Replies:** 5\ **Last updated:** [June 23, 2025, 3:44am UTC](https://forum.cadet-web.de/t/negative-elution-with-langmuir-mpm/1235 "2025-06-23T03:44:20Z")
Expected behavior. Fit Langmuir MPM parameters (offline) to match desired pH dependence. Use fit params to simulate bind, wash, and elute. Actual behavior With certain combinations of MPM params (Ka, gamma, beta) , no b… --- ## [Issue plotting comparator in CADET Process v0.11](https://forum.cadet-web.de/t/issue-plotting-comparator-in-cadet-process-v0-11/1230)
**Author:** [@Will\_m32](https://forum.cadet-web.de/u/Will_m32)\ **Replies:** 4\ **Last updated:** [June 13, 2025, 3:53pm UTC](https://forum.cadet-web.de/t/issue-plotting-comparator-in-cadet-process-v0-11/1230 "2025-06-13T15:53:16Z")
Expected behavior. Hi CADET team, I am having trouble running the “comparator.plot\_comparison(simulation\_results)” since updating to Cadet-Process 0.11 from 0.10. This occurs when plotting the comparator directly and wi… --- ## [Cannot import name 'NumpyProxyArray' from 'CADETProcess.dataStructure'](https://forum.cadet-web.de/t/cannot-import-name-numpyproxyarray-from-cadetprocess-datastructure/1229)
**Author:** [@101abhinav](https://forum.cadet-web.de/u/101abhinav)\ **Replies:** 2\ **Last updated:** [June 12, 2025, 6:59am UTC](https://forum.cadet-web.de/t/cannot-import-name-numpyproxyarray-from-cadetprocess-datastructure/1229 "2025-06-12T06:59:31Z")
Expected behavior. I am trying to run my code in which I faced the issue saying cannot import name 'NumpyProxyArray' from 'CADETProcess.dataStructure' (C:\\Users\\modia\\anaconda3\\envs\\cadet-env\\lib\\site-packages\\CADETProc… --- ## [CSTR causes hanging simulation with low values](https://forum.cadet-web.de/t/cstr-causes-hanging-simulation-with-low-values/1217)
**Author:** [@rosario.cervellere](https://forum.cadet-web.de/u/rosario.cervellere)\ **Replies:** 3\ **Last updated:** [June 5, 2025, 8:11am UTC](https://forum.cadet-web.de/t/cstr-causes-hanging-simulation-with-low-values/1217 "2025-06-05T08:11:43Z")
Expected behavior. Simulation runs with CSTR init\_liquid\_volume \< 1e-4 Actual behavior Simulation hangs with CSTR init\_liquid\_volume \< 1e-4 How to produce bug (including a minimal reproducible example) import pandas as… --- ## [Having Trouble with cadet Path requirement for Cadet-Process import](https://forum.cadet-web.de/t/having-trouble-with-cadet-path-requirement-for-cadet-process-import/1218)
**Author:** [@101abhinav](https://forum.cadet-web.de/u/101abhinav)\ **Replies:** 5\ **Last updated:** [June 3, 2025, 5:58pm UTC](https://forum.cadet-web.de/t/having-trouble-with-cadet-path-requirement-for-cadet-process-import/1218 "2025-06-03T17:58:18Z")
Expected behavior. I am trying to run my test code to see if the cadet has installed properly. But when I run it, it gives the error that cadet cannot be auto detected, please provide the specific path for which I have t… --- ## [Import Error while importing Cadet-process module function](https://forum.cadet-web.de/t/import-error-while-importing-cadet-process-module-function/953)
**Author:** [@Omparv](https://forum.cadet-web.de/u/Omparv)\ **Replies:** 7\ **Last updated:** [May 31, 2025, 2:10pm UTC](https://forum.cadet-web.de/t/import-error-while-importing-cadet-process-module-function/953 "2025-05-31T14:10:00Z")
Hi Everyone, I have tried using cadet-process (being a new user to cadet hence more user friendly), but i am unable to import source and sink post installing cadet-process and am facing import error. Below is the code … [Next page](https://forum.cadet-web.de/c/cadet-troubleshooting/13.md?page=1)