UE4Editor-(name).dll is missing problem

Hi guys, I have problems with launching my project “The following modules are missing or built with a different engine version: UE4Editor-(name).dll Would you like to rebuilt them now?”
And when I press yes it says “(name) could not be compiled. Try rebuilding from source manually.”
When I right click on the uproject file “Generate Visual Studio project files” it says “This project does not have any source code. You need to add C++ source files to the project from the Editor before you can generate project files.” Can you guys help me PLEASE?