1.open sd card in windows.
2.download 2 softwares ( md5 calculator and notepad++) jus google them and install.
3.open clockwork folder in sd via computer->backup->(your back).
4.now right click on nandroid.md5 and edit with notepad++
5.green highlighted phrase is a key.
6.right click on rest every file in backup folder individually->md5 calculator
7.match the key to that of notedpad++ file
8.if they dont match copy key from md5 calculator and paste in notepad
9.save and exit.
10.now try recovery it;ll work.