Hey I actually managed to solve this, by changing the Advanced Sessions plugin file to use “Preload” instead of “default”. Not sure if that’s the right fix or not but it got the game working again for me!
if you open the .Uplugin with text editor (you will find it in the plugins folder) you can then find a parameter called loading phase you need to change it from default to preload so that the plugin modules are loaded early so that any blueprints needs them can compile safely