I see that Quest Extension plugin started a little bit earlier than Quest System (so it started without any errors) and after that Quest System trying to start but without success (normal behavior, if other plugin loaded classes with the same name previously).
And you wrote about UQuest class, which probably can be in both plugins. As I said before, it can be a sign of naming collisions. It would be nice to check if it’s true.
As for the “hot reload” text in logs - if your project is a C++ project, then try to close the UE4 editor and recompile your project in VS with the closed editor. In case if there is any old hot reload files in your project, it will clean them.
If you still need my further support, it would be better to contact me via support email (air.kelheor@gmail.com) to not disturb author of the other plugin.