Remove the invalid system-wide credential helper so Git no longer calls the broken binary. As Joas mentioned above run the following:

1. Find "bash.exe" at git folder installation - default is "C:\Program Files\Git\bin";
2. Double click bash.exe;
3. At the command line type: mkdir /tmp

If you are see error:

Unhandled Exception: System.IO.FileLoadException: Could not load file or assembly 'System.Memory, Version=4.0.1.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference.

1. open bash.exe
2. git config --system --unset-all credential.helper