# \#symmetrical

**URL:** https://forum.plexim.com/tag/symmetrical/184.md

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## [How to resolve error with discrete step solver when the simulation is moved from one version to another?](https://forum.plexim.com/t/how-to-resolve-error-with-discrete-step-solver-when-the-simulation-is-moved-from-one-version-to-another/799)

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**Author:** [@snehathakur](https://forum.plexim.com/u/snehathakur)\
**Replies:** 0\
**Last updated:** [July 15, 2020, 10:18pm UTC](https://forum.plexim.com/t/how-to-resolve-error-with-discrete-step-solver-when-the-simulation-is-moved-from-one-version-to-another/799 "2020-07-15T22:18:16Z")

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Hi I am using Plecs blockset (4.3.6) with Matlab 2019b. The model works fine both in variable-step solver and discrete step solver. However, when I export the model from Matlab 2019b to Matlab 2017b with Plecs blockset…