My time machine back up error and now it says it can not read my external hard drive

I have a MacBook Pro Yosemite ...... I was backing up to a WD Elements external hard drive disk and I was in mid back up and everything was going fine..... then an error and when I went back to it ..... it said it no longer can read my disk? What can i do?

A  whole  lot  about  Time  Machine for help with TM problems.  Also you can select Mac Help from the Finder's Help menu and search for "time machine" to locate articles on how to use TM.  See also Mac 101- Time Machine.
Use Disk Utility to repair the TM drive.  If that doesn't help, and you don't find help from the above, then erase the drive and start a new TM backup.

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