COBRA update initialisations error updateCobraToolbox

What does the error below mean: Thanks

>> updateCobraToolbox > Checking for available updates ... fatal: ambiguous argument 'HEAD': unknown revision or path not in the working tree. Use '--' to separate paths from revisions, like this: 'git command [<revision>...] -- [<file>...]' > The SHA1 of the last commit could not be retrieved.HEAD fatal: ambiguous argument 'HEAD': unknown revision or path not in the working tree. Use '--' to separate paths from revisions, like this: 'git command [<revision>...] -- [<file>...]' Warning: The name of the current feature (branch) could not be retrieved. > In updateCobraToolbox>getCurrentBranchName (line 171) In updateCobraToolbox (line 29)