cannot apply the encryption to the exe file with a new source thats not patched

[rhys119]

Im getting the error cannot apply the encryption to the exe file it seems to be invalid or already patched
its not already patched im using on the .exe of the jetman Gunz 1.5 https://forum.ragezone.com/f245/gunz-1-5-challengequest-blitz-1200934/
how do i encrypt me client when it tells me this error

 

[xDividerx]

Screenshot of error.