When clicking on the "create a search index" button i get an error:
Server Error in '/' Application.
No pipe registered with name 'ContentInboundPipe'!
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.ArgumentException: No pipe registered with name 'ContentInboundPipe'!
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Any idea, what this is, and how i can fix it?
That fixed it.