Hello, I am not able to disable the plugin, since it is already implemented in my code. So I just took the plugin out of /EpicGames/Ue4.13/Source/Plugin/Marketpace/ and dropped it onto the new server files - and it actually solved the prohlem. 
Hello, I am not able to disable the plugin, since it is already implemented in my code. So I just took the plugin out of /EpicGames/Ue4.13/Source/Plugin/Marketpace/ and dropped it onto the new server files - and it actually solved the prohlem.