doc/forum/git_unlock_failed.mdwn

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+I am trying to 
+
+```
+$ git annex unlock myfile
+```
+
+but it gives
+
+```
+unlock myfile
+git-annex: unlock failed
+failed
+unlock: 1 failed
+```
+
+I have no idea why, and the error gives me no means to debug (nor was an internet search helpful). Note that e.g.
+
+```
+$ cat myfile
+```
+
+works fine