Why is Encrypt Disk greyed in OSX 10.12.5 Sierra?

I need a solution

I installed End Point Encryption aka PGP whole disk, but I have no means to encryp my drive or any external drive since the Encrypt Disk option is grayed. Please advise. I have entered a valid licence, it was approved..etc.  Picture attached. Many thanks. 

 Screen Shot 2017-07-01 at 01.46.03.png



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