Hey Ravi, I think I know what’s going on.
There’s another plugin conflicting with Speckle.
You could search for the a file named Serilog in the various addin folders:
%appdata%\Autodesk\Revit\Addins\
%appdata%\Autodesk\ApplicationPlugins\
C:\ProgramData\Autodesk\Revit\Addins\
C:\ProgramData\Autodesk\ApplicationPlugins\
C:\Program Files\Autodesk\Revit 20XX\AddIns\
Or in the Dynamo one:
%appdata%\Dynamo\Dynamo Revit\2.16\packages\SpeckleDynamo2
And then disable such addin, please let us know if you find anything!