Migrating to Blisspop Taoshan v3.0 from v2.2

Hello folks,

I installed Blisspop Taoshan v2.2 on my Sony Xperia L.
I saw Blisspop Taoshan v3.0 was released and so I downloaded and tried to install it by Cynogen Recovery.
But I got an error which says something like this

Code:

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...
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signature verification failed
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E: volume misc error
installation abort

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What are the possible issues for this error?

Note : I downloaded Blisspop Taoshan v3.0 from official blosspop download page

Thanks in advance!