There is build error when editor opened

There is build error when editor opened. If I close editor, it will be build.

Error 28 error : Failed to produce item: C:\Users\AhmetFaruk\Desktop\TenekurOffline\Binaries\Win64\UE4Editor-TenekurOffline.pdb C:\Users\AhmetFaruk\Desktop\TenekurOffline\Intermediate\ProjectFiles\ERROR TenekurOffline

Error 6 error LNK1104: cannot open file ‘C:\Users\AhmetFaruk\Desktop\TenekurOffline\Binaries\Win64\UE4Editor-TenekurOffline.dll’ C:\Users\AhmetFaruk\Desktop\TenekurOffline\Intermediate\ProjectFiles\LINK TenekurOffline

Error 29 error MSB3073: The command “C:\Users\AhmetFaruk\Desktop\4.7\Engine\Build\BatchFiles\Build.bat TenekurOfflineEditor Win64 Development “C:\Users\AhmetFaruk\Desktop\TenekurOffline\TenekurOffline.uproject” -rocket” exited with code -1. C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.MakeFile.Targets 38 5 TenekurOffline

mmmh nnot going through that text, so it might be another reason. but basicly if u build a project.dll with ur gamelogic. when u ahve openened the game/editor its getting used and u cant overrite it. thats why u get the error.