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project error on launch

im new to unreal engine. i followed a tutorial. in the tutorial i had to add a class (for the player charecter). then i got a small warning.
after opening the unreal editor i tried to open my project but it gave me an error and a fix button. after trying the fix button i got another error telling me to fix it manually.
how do i do that?
how can i fix this?

my project is called “Test1”

error:
the following modules are missing or built with a different engine version

UE4editor-Test1.dll
Would you like to rebuild them now?
[yes] [no]

second error:
Test1 could not be compiled. try rebuilding from source manually.
[OK]

thanks alot,
Kelvin