# MWServer Crash + Previous MWorks Error don't reload

**URL:** <https://mworks.discourse.group/t/mwserver-crash-previous-mworks-error-dont-reload/916>\
**Category:** Support\
**Created:** [October 6, 2023, 6:31pm UTC](https://mworks.discourse.group/t/mwserver-crash-previous-mworks-error-dont-reload/916 "2023-10-06T18:31:55Z")\
**Posts on this page:** 1\
**Showing post:** 17

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**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\
**Post date:** [October 20, 2023, 4:42pm UTC](https://mworks.discourse.group/t/mwserver-crash-previous-mworks-error-dont-reload/916/17 "2023-10-20T16:42:23Z")

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Hi Nina,

I have tried to replicate your MWorks+LabJack setup as closely as possible, and I am unable to reproduce your error.

Here’s my setup:

- 2018 Mac mini (Intel)
- macOS 13.6
- Xcode 15.0.1
- [MWorks 0.12.2](https://s3.amazonaws.com/mworks-downloads/release/MWorks-0.12.2.dmg)
- [Latest commit](https://github.com/histedlab/LabJackU6-hist/commit/b8e4d38f1d72e004fe95a93d309c35cca5fc7755) of LabJack plugin code

After building and installing the LabJack plugin, I can load an experiment with a LabJack device, run it, re-run it, unload it, re-load it, run it again, and quit MWServer without any issue.

One comment: You said you’re running MWorks 0.12, but in [another discussion](https://mworks.discourse.group/t/mwclient-cannot-connect-to-mwserver-localhost/922), the actual version you were running is “0.12.dev (2023.03.01)”. In case it wasn’t clear, that date stamp at the end matters. If you compile a plugin against “0.12.dev (2023.03.01)”, you can’t run it against, say “0.12.dev (2023.04.16)”. The version must be _exactly the same_. You’re probably already aware of this, but I just want to make sure.

I’ve attached my build of the plugin, in case you want to try it. As I said, it’s compiled against the release version of [MWorks 0.12.2](https://s3.amazonaws.com/mworks-downloads/release/MWorks-0.12.2.dmg), so you can only use it with that.

Cheers,  
Chris  
[LabJackU6Plugin.bundle-MWorks-0.12.2.zip](https://mworks.discourse.group/uploads/short-url/j33OXEr0holrhnGXhMDCOXWrhYu.zip) (234.7 KB)

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