From @himiten on Mon Jan 23 2017 03:55:07 GMT+0000 (UTC)
$ ipfs cat /ipfs/QmPnnvFkvSCmPvMdMtSNbXrFWQX5XYc4YkcVU4cujyyH8Z/readme
Error: cannot acquire lock: file “C:\Users\10667\.ipfs\repo.lock” already locked
Copied from original issue: https://github.com/ipfs/support/issues/50