MEC-Error: "Importing library data from an automatically synchronized library into a library that requires synchronization is not supported."

 I created a new project in MEC, where I added a role and a task. I then exported the project and imported it into DNG. I exported the project with exposure possibilities, i.e. library, plug-in, configuration.
I imported the ReqIF files individually into DNG and then exported them again from DNG. Until then, there are no problems. When I imported the ReqIF files back into RMC, there was an error that "Importing library data from an automatically synchronized library into a library that requires synchronization is not supported." I have made sure that I
the creation of the library has turned off the synchronization.