Can't open project (new function problem)

First i cut and paste a group with all functions in another event sheet, the functions changed name from Danno in Danno2 (this for all the functions) and when i tried to write the Original name Danno it says that there is another function with this name, so i thinked that the program didn't see that i deleted the last function (and they was still present in the list of the function)so i just saved and reopened after and now i can't open the project because:" invalid function name "Danno"" and probably with all the others... how can i fix that?