My disk utility option to turn off encryption does not highlight so I can't turn off the encryption of my external hard drive with time machine back up

I have an iMac and Retina MBP. I use Time Capsule for backup of iMac and I wanted to use an external hard drive attached to time capsule as time machine backup. The problem is that I encrypted previously that external hard drive and now Time Capsule does not recognize it.
When I try to turn off encryption with Disk Utility, that option is not highlighted so I cannot use it.
I tried with terminal but it answers The given UUID is a not a CoreStorage Logical Volume UUID

Can you plug in the hard drive directly to your MBP and then decrypt the hard drive?  You should be able to do this by opening up Finder and then either right clicking the hard drive (holding down two fingers and clicking) or holding down ctrl and then clicking on the hard drive.

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    Hi, I tried your advice and it tells me the external drive is ok, and the ERASE section is grey, probably because I encrypted the disk!?!
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    Not tech savvy at all and barely understand basics. I need very simple and easy to understand explanations.

    sydababy wrote:
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    BIG BIG MISTAKE ..... youre making a linchpin deathtrap for your data trying to shove everything on a single fragile HD.
    Dont suffer the tragedy other people make, buy another or 2 more HD, theyre cheap as dust.
    The number of people who have experienced terror by having a single external HD backup is enormous.  One failure that WILL HAPPEN, and kaput,......all gone!
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    follow here:
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    The Tragedy that will be, the tragedy that never should be
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  • Unable to erase external hard drive with Disk Utility

    Macbook Pro (mid 2010) running 10.9
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    If this is your only backup device, you need to start a new backup on another drive immediately. Don't erase (or try to erase) your only backup.
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