Why can i not compile anymore in 4.9.2

Development Programming & Scripting
2

after removing the parts UE Header Tool created for me,

and after removing the plugin AdvancedSessions it compiles…

See this thread for that:

where is the difference between 4.8 and 4.9? i only have those compiling problems since the release of 4.9

im developing with visual studio 2015 under windows 10