Constant crashes on compile

For some reason my Code compiles just fine in VS2015, yet if i try to compile it in EU4 it causes an assertion error crash every time. Even if i compile in VS2015 while the editor is open it does this. If i compile in VS2015 then compile in ue4 after i restart it, it doesnt crash however. If i close the editor and compile in VS2015 then open editor the changes work as expected. this has made the editor completely unusable.

The UE4-Oddaron Editor has crashed and will close

Assertion failed: bPrepareCppStructOpsCompleted [File:E:\UnrealEngine-release\Engine\Source\Runtime\CoreUObject\Public\UObject\Class.h] [Line: 1055]

dont know why, but now it doesnt do it…