Unable to push or fetch

When i tri to push o fetch the conso show an error :

git -c diff.mnemonicprefix=false -c core.quotepath=false --no-optional-locks push -v --set-upstream origin DDE_720:DDE_720
fatal: ArgumentException encountered.
Un �l�ment avec la m�me cl� a d�j� �t� ajout�.

error: cannot spawn C:\Users\s.gremling\AppData\Local\SourceTree\app-3.0.6\tools\Askpass.exe: No error