Openstudio 1.2.0

We’ve just installed openstudio 1.2.0 (wich is working ok alone) and sketchup 2021, but are having an issue with the plugin installation to make them work together; this is the message i’ve been receiving:
“This application failed to start because no Qt plattform plugin could be initialized. Reinstalling the application may fix this problem.
Available platform plugins are: windows”
Does anyone know a procedure to fix this issue?
Thank you in advance.