https://forums.autodesk.com/t5/revit-api-forum/revit-api-csharp-addin-error-cannot-run-when-installing-pyrevit/m-p/10477177#M24749 <P>I would suggest checking whether this behaviour has already been discussed in the pyRevit repository. If not, you might want to raise an issue for it there.</P> <P>&nbsp;&nbsp;</P> Sun, 18 Jul 2021 08:30:08 GMT jeremy_tammik 2021-07-18T08:30:08Z https://forums.autodesk.com/t5/revit-api-forum/revit-api-csharp-addin-error-cannot-run-when-installing-pyrevit/m-p/10472771#M24748 <P><SPAN>Hello everyone, hope you can help me!</SPAN></P><P><SPAN>Normally if I don't have pyRevit installed =&gt; My add-in works OKay.</SPAN></P><P><SPAN>But when i install pyRevit =&gt;&nbsp; run my add-in again it gives the following error:&nbsp;Set property 'System.Windows.ResourceDictionary.DeferrableContent' threw an exception.</SPAN></P><P>&nbsp;</P><P><SPAN><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Capture.PNG" style="width: 454px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/941931iAD8C90360E9D2821/image-size/large?v=v2&amp;px=999" role="button" title="Capture.PNG" alt="Capture.PNG" /></span></SPAN></P><P><SPAN>Thanks everyone!!!</SPAN></P> Fri, 16 Jul 2021 01:53:35 GMT https://forums.autodesk.com/t5/revit-api-forum/revit-api-csharp-addin-error-cannot-run-when-installing-pyrevit/m-p/10472771#M24748 Anonymous 2021-07-16T01:53:35Z https://forums.autodesk.com/t5/revit-api-forum/revit-api-csharp-addin-error-cannot-run-when-installing-pyrevit/m-p/10477177#M24749 <P>I would suggest checking whether this behaviour has already been discussed in the pyRevit repository. If not, you might want to raise an issue for it there.</P> <P>&nbsp;&nbsp;</P> Sun, 18 Jul 2021 08:30:08 GMT https://forums.autodesk.com/t5/revit-api-forum/revit-api-csharp-addin-error-cannot-run-when-installing-pyrevit/m-p/10477177#M24749 jeremy_tammik 2021-07-18T08:30:08Z