After update to 2.6.3.0 "Fatal: cannot use . as an exclude file"

[Vivien]

I keep getting this error when opening any repository after updating to the newest version of Sourcetree (on Win 10): 

I am even getting the error after cloning an empty Bitbucket repository. It's exactly the same error for every repository I open. I can close the error message but not push or pull any changes with a similar error message: 

warning: unable to access '.': Permission denied
fatal: cannot use . as an exclude file

Can somebody please help with this? 

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Addition: 

I tried uninstalling and deleting all preferences, then reinstalling the older version 2.5.5.0 (which funny enough is the newest version you can download from atlassian.com). But the error still appears. 

[Vivien · Accepted solution]

Fixed: I updated Git, as suggested to v2.17 (as was required with the new Sourcetree version), but forgot to point Sourcetree to the system Git installation. So I guess it was caused by an old Git version...

[KiwiLee]

I had the same problem today. 

The actual solution is to blank out the field Global Ignore List or select a .gitignore that is relevant to your use.

You would have had a rogue . in this field.

Menu: Tools - Options and click the Git tab.

Lee.