# Dynamo Will not Launch - System.ArgumentException

**URL:** <https://forum.dynamobim.com/t/dynamo-will-not-launch-system-argumentexception/61993>\
**Category:** Uncategorized\
**Created:** [March 23, 2021, 10:11am UTC](https://forum.dynamobim.com/t/dynamo-will-not-launch-system-argumentexception/61993 "2021-03-23T10:11:34Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jonny.pye](https://avatars.discourse-cdn.com/v4/letter/j/3e96dc/32.png) [@jonny.pye](https://forum.dynamobim.com/u/jonny.pye)\
**Post date:** [March 23, 2021, 10:11am UTC](https://forum.dynamobim.com/t/dynamo-will-not-launch-system-argumentexception/61993/1 "2021-03-23T10:11:34Z")

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I am having issues when trying to open dynamo only in Revit 2021. The below happens when I try to open generative design, dynamo and dynamo player.

- I have uninstalled and reinstalled Revit
- Uninstalled every single Add in I have
- Deleted all packages in the pathed folder.

Has anyone seen this before?

 ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/3/d/3de64c7191e946bbbf49ce4eadd0aebaa51f6d1d.png)

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**Author:** ![ANDREW.SCHRADER](https://avatars.discourse-cdn.com/v4/letter/a/0ea827/32.png) [@ANDREW.SCHRADER](https://forum.dynamobim.com/u/ANDREW.SCHRADER)\
**Post date:** [February 17, 2022, 6:35pm UTC](https://forum.dynamobim.com/t/dynamo-will-not-launch-system-argumentexception/61993/2 "2022-02-17T18:35:00Z")

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We are having that issue right now also and would like a fix.

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**Author:** ![G-FUNG](https://avatars.discourse-cdn.com/v4/letter/g/edb3f5/32.png) [@G-FUNG](https://forum.dynamobim.com/u/G-FUNG)\
**Post date:** [March 8, 2023, 5:54am UTC](https://forum.dynamobim.com/t/dynamo-will-not-launch-system-argumentexception/61993/3 "2023-03-08T05:54:25Z")

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same issue here

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**Author:** ![chuongmep](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/chuongmep/32/197537_2.png) [@chuongmep](https://forum.dynamobim.com/u/chuongmep)\
**Post date:** [March 8, 2023, 5:57am UTC](https://forum.dynamobim.com/t/dynamo-will-not-launch-system-argumentexception/61993/4 "2023-03-08T05:57:32Z")

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> [@REVIT 2021 Dynamo Will Not Open](https://forum.dynamobim.com/t/revit-2021-dynamo-will-not-open/87066/2):
>
> Seems like it is related to this.

> [@Dynamo not loading in Revit 2021](https://forum.dynamobim.com/t/dynamo-not-loading-in-revit-2021/87026):
>
> Dynamo not loading in Revit 2021. below error is appearing when i click on Dynamo icon. [image]

> [@Can't open dynamo in Revit 2021](https://forum.dynamobim.com/t/cant-open-dynamo-in-revit-2021/87040/3):
>
> This appears to be the analytics issue which has plagued a few users of late. Now seeing ~2 a day. I have requested a hotfix and/or tool to fix the issue, hopefully we’ll get some movement in the long term. As of now I am not yet sure how to resolve the issue, but add-ins will not help. @Kzs_David please submit a ticket to the Revit support team so we can get you in touch with the right people, and get you sorted. Best to do so via the accounts portal at [Manage.Autodesk.com](http://Manage.Autodesk.com).

> [@If you cannot launch Dynamo in Revit 2021 with NullReference IsOptedIn error](https://forum.dynamobim.com/t/if-you-cannot-launch-dynamo-in-revit-2021-with-nullreference-isoptedin-error/87068):
>
> We have been getting more reports of an issue affecting Dynamo / Autodesk analytics. There are a few analytics launch issues floating around the forum so please check the stack trace here to ensure you’ve seen this particular stack trace before trying this workaround. [2023-03-07\_06-41-51] We believe the issue is with an update to ADP - Autodesk’s analytics component that Dynamo uses. This can be installed globally automatically or by other applications - a particular version 4.4.0 causes is…