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Reinstalled packages one by one and the issue disappeared. But found out that quite a lot of dependencies are not compatible with Episerver.CMS 11.3.0 + Episerver.ServiceLocation.StructureMap 2.0.0.
The solution for now to not update these two packages.
I just saw "TinyMce" in your list and just wanted to point out that it's now it's own package (here's a list of new packages in CMS 11). In case you didn't already know that :)
One more tip, for others that might be stuck.
Had a similar issue in upgrading to Episerver 11.5.1, where forceBinFolderScan="false" along with some assembly exclusions prevented Episerver from starting correctly.
/Casper
Just upgraded my project to CMS 11.3.0 and got this error:
Basically, it fails to load all modules. Do I have to configure something?
Looking at the changes no documentation or description how to do it: https://world.episerver.com/documentation/Release-Notes/?versionFilter=11.3.0&packageFilter=EPiServer.CMS.Core&typeFilter=All