Checking out worktree gst-plugins-good in /home/meh/devel/gst-1.14/subprojects/gst-plugins-good (branch 1.14)

Could not checkout worktree subprojects/gst-plugins-good, please fix and try again. Error:

fatal: invalid reference: 1.14
 Command '['git', 'worktree', 'add', '/home/meh/devel/gst-1.14/subprojects/gst-plugins-good', '1.14']' returned non-zero exit status 128.