# Dynamo Will not Launch - System.ArgumentException **URL:** \ **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:** 1\ **Showing post:** 4
**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")
> [@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… --- _[View the full topic](https://forum.dynamobim.com/t/dynamo-will-not-launch-system-argumentexception/61993)._