topic Re: Error uri resource when Click button in Revit in Revit API Forum

Error uri resource when Click button in Revit

manhgt214 — Fri, 25 Apr 2025 01:27:59 GMT

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!

Re: Error uri resource when Click button in Revit

jeremy_tammik — Fri, 25 Apr 2025 04:53:55 GMT

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

Re: Error uri resource when Click button in Revit

manhgt214 — Mon, 28 Apr 2025 07:39:57 GMT

Thank you! I try find solution and reply soon

Re: Error uri resource when Click button in Revit

manhgt214 — Mon, 23 Jun 2025 08:32:29 GMT

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

Re: Error uri resource when Click button in Revit

plDev2024 — Sun, 26 Oct 2025 10:25:35 GMT

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".