I am experiencing weird dynamo breaking issues in Revit. Revit doesn’t crash or break nor does dynamo it just gives errors and becomes unusable.
This only happens in 2026, its been happening across multiple so multiple restarts as well as across other users computers. I have disabled all non ADSK add-ins and this still occurs and no Dynamo Packages.
Dynamo Core 3.6.2.11575
Dynamo Revit 3.6.0.2194
When in Revit 26 trying to open a script i get the following warning.
image611×358 7.77 KB
The scripts however does open in an unopened tab
image542×342 8.21 KB
However all nodes are placed on top of each other and the run is blocked
image1135×1066 95.7 KB
Additionally the code blocks are placed as blank.
image438×281 2.83 KB
Usually this is a dependency conflict with an add-in to Revit or Dynamo.
Disable all Revit add-ins, Dynamo packages and customizations. If that fixes the issue you can reenable the Dynamo stuff and then Revit stuff in groups until it recreates - whichever recreates is the conflict and will need to remain disabled until you get an updated version.
If disabling everything doesn’t fix it, you may have another issue at play - restart the CPU, recreate the issue and then quit Revit. Grab the Dynamo log and Revit journal from the new session and post them here (or contact support via the accounts portal at manage.autodesk.com).
Thanks for the response! I have uninstalled all add-ins and packages from dynamo and Revit and I still receive the error. Additionally other users with different packages and add-ins installed also get the error. The only consistent thing between the 4 of us is it happening in Revit 26 as well as the actual error itself.
I even cleared the dynamo 3.6 version folder in app data/roaming and that did not change it either.
Here is the log of it breaking
2026-04-08 05:36:57Z : notification:Error Opening File:
Unknown error opening file: C:\Users\user\Downloads\AreaVolumeSettingsToggle.dyn:
System.MissingMethodException: Method not found: ‘RevitDynamoModelState Dynamo.Applications.DynamoRevit.get_ModelState()’.
at Dynamo.Models.DynamoModel.OpenJsonFileFromPath(String fileContents, String filePath, Boolean forceManualExecutionMode, Boolean isTemplate)
at Dynamo.Models.DynamoModel.OpenFileFromPath(String filePath, Boolean forceManualExecutionMode)
at Dynamo.Models.DynamoModel.OpenFileImpl(OpenFileCommand command)
at Dynamo.Applications.Models.RevitDynamoModel.OpenFileImpl(OpenFileCommand command)
at Dynamo.Models.DynamoModel.OpenFileCommand.ExecuteCore(DynamoModel dynamoModel)
at Dynamo.Models.DynamoModel.RecordableCommand.Execute(DynamoModel dynamoModel)
at Dynamo.Models.DynamoModel.ExecuteCommand(RecordableCommand command)
at Dynamo.ViewModels.DynamoViewModel.ExecuteCommand(RecordableCommand command)
at Dynamo.ViewModels.DynamoViewModel.Open(Object parameters)
Restart the CPU, recreate the issue, quit Revit, provide the full Dynamo log and the Revit journal.