# Download/Technical Issues

**URL:** https://discourse.macromodelbase.com/c/technical-issues/6.md

[Latest](https://discourse.macromodelbase.com/latest.md) · [Categories](https://discourse.macromodelbase.com/categories.md)

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## [About the Download/Technical Issues category](https://discourse.macromodelbase.com/t/about-the-download-technical-issues-category/16)

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**Author:** [@MMBTeam](https://discourse.macromodelbase.com/u/MMBTeam)\
**Replies:** 0

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Get help regarding download, installation and further technical issues here.

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## [Reported error: "operator +: nonconformant arguments (op1 is 1x8, op2 is 1x4)"](https://discourse.macromodelbase.com/t/reported-error-operator-nonconformant-arguments-op1-is-1x8-op2-is-1x4/273)

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**Author:** [@Julian\_Schuster](https://discourse.macromodelbase.com/u/Julian_Schuster)\
**Replies:** 0\
**Last updated:** [December 25, 2025, 11:56am UTC](https://discourse.macromodelbase.com/t/reported-error-operator-nonconformant-arguments-op1-is-1x8-op2-is-1x4/273 "2025-12-25T11:56:18Z")

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Hi, I’m new here. I use Octave 9.2 and Dynare 6.2. I installed the MMB program and tried to start it. However, when I run a model, an error appears. Unfortunately, I don’t know how to fix it. I would be really grateful …

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## [Compatibility error (Mac OS Big Sur) (Process quit with exit code 1)](https://discourse.macromodelbase.com/t/compatibility-error-mac-os-big-sur-process-quit-with-exit-code-1/157)

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**Author:** [@Tim1](https://discourse.macromodelbase.com/u/Tim1)\
**Replies:** 2\
**Last updated:** [June 27, 2022, 9:35am UTC](https://discourse.macromodelbase.com/t/compatibility-error-mac-os-big-sur-process-quit-with-exit-code-1/157 "2022-06-27T09:35:15Z")

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Hello, I have a problem with the compatibility of MATLAB and Dynare. When I open mmb-electron and run the compatibility check in the settings, I always get the error message shown in the picture. Operating system: …

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## [Reported error: "Brace indexing is not supported for variables of this type."](https://discourse.macromodelbase.com/t/reported-error-brace-indexing-is-not-supported-for-variables-of-this-type/111)

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**Author:** [@jtang2020](https://discourse.macromodelbase.com/u/jtang2020)\
**Replies:** 2\
**Last updated:** [February 7, 2020, 1:28pm UTC](https://discourse.macromodelbase.com/t/reported-error-brace-indexing-is-not-supported-for-variables-of-this-type/111 "2020-02-07T13:28:38Z")

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Hi, I am new to MMB and just set up the platform. And the installed Matlab and dynare have passed the compatibility test as well. However, whatever model I chose, the system always reported the error as below. Is it du…