Class Not found

[Zeterd]

Hello,
I'm having trouble running examples in the openflow project of the inet framework. The error keeps popping up like this:

This issue happened before in another project with INET and the SEA++ framework, and I couldn't find a fix. I thought it might be a problem with OMNET++ installation, but even after reconfiguring and reinstalling, the problem persists.

I've also checked the OMNET IDE settings, but couldn't find anything wrong.

I noticed this error occurs when trying to run scenarios/examples where the NED module is simple. I'm using OMNET++ version 6.0 and INET version 4.4.

Am I missing something? Is there some extra configuration I need to do?

Thanks