Error uri resource when Click button in Revit

[manhgt214]

Hello Everyone!

I dont know why my revit project when click button is show error in below.
・I tested by Add-In Manager run dll file -> work fine
・I try close Revit then Restart then -> work fine.
Thank Advance!

[jeremy_tammik]

Sorry, cannot suggest anything. It is impossible to diagnose based on the limited information provided.

[manhgt214]

Thank you! I try find solution and reply soon

[manhgt214 · Accepted solution]

Sorry I tried find solution and below is new information:

I realize after run .dll file same with .dll file built to add-in by add-in manager then after click a button will show that error
But only class created by Wpf, class not contain wpf or form created by windows form not error

I using add-in manager to run it because I want debug it.

Maybe when run by add-in manager file assembly then click to button make by it => not correct.
this is folder add-in manager auto copy dll file and excuted assembly

this is my addin folder

...and error

[plDev2024]

I had exactly the same issue. When loading the testing program via Addin-Manager, all WPF programs on the Revit ribbon stop working and require a Revit restart.

It seems that use Addin-Manager to load a .dll that has already been added to the Revit UI causes confusion—maybe the newer version overwrites the existing one.

Only WPF programs are affected; WinForms and non-UI programs continue to work.

My workaround is to rename the .dll when loading via Addin-Manager by adding a suffix such as "_test".