When doing a commit of an edited file "todo.txt", using the bitbucket web interface, I get the following error dialog.

BitBucket(5.7.0) is running on a windows server 2016.
Git for windows (version 2.16) has been installed with the option that enables git in both bash and cmd.
BitBucket is installed as a service, currently runs under a user that has full access to the bitbucket home and installation dir.
Any help would be much appreciated.