Problems migrating App from Mx7 to Mx 8

Hi guys, I want to migrate my project from Mx7 to Mx8. I completely followed the Ref guide: Moving from Desktop Modeler Version 7 to Studio Pro 8 . I still have some problems when I run my project locally and I don't know how I can fix this. Maybe you can help me? When I run my project locally, after I gave my credentials I see this screen: When I click a role, the content of the screen only copies and the roles are viewed twice. This continues when I click a role again.  In the console I see these errors:
1 answers

Did you migrate your theme properly? It seems your index.html is referring to files that no longer exists.

Or just a browser cache issue?