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Does not allow me to Push, fatal: ArgumentException encountered.

Hi, I am trying to push a change from a local to the depository, but when i do so it come with this error and its really frustrating. 

git -c diff.mnemonicprefix=false -c core.quotepath=false --no-optional-locks push -v --tags --set-upstream XXXXXXXX-site master:master

fatal: ArgumentException encountered.

   An item with the same key has already been added.


fatal: ArgumentException encountered.

   An item with the same key has already been added.


remote: Invalid username or password

fatal: Authentication failed for ''


Pushing to

Completed with errors, see above.

Please Help

1 answer

0 votes
Atlassian Team
Atlassian Team members are employees working across the company in a wide variety of roles.
Mar 11, 2019


This looks like an old bug in the Git Credential Manager for Windows, GCM, that is bundled with Git for Windows to manage credentials.

Please with upgrade the GCM directly or update to Git for Windows 2.20.1 which includes a fixed GCM.

You can do this either by installing Git 2.20.1 directly and configuring Sourcetree to use it, via the Tools/Options/Git tab, or update to Sourcetree 3.0.17 and update the embedded Git in Tools/Options/Git tab.


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