problems compiling within the unreal engine 4 editor

hi, i’m having problems compiling the code from within the unreal engine editor.

i’m trying the fps tutorial from the wiki, there i saw that i can compile the code from within the engine if i don’t add any new function, if i modify the current game function that i have already create i can compile the code within the unreal editor, but when i tried to compile i always receive some error messages, but if i compile the code into the visual studio it will work just fine.

any body has this problem ?