Probably is not the problem about that "sign" error but next line, out of memory error. Check if there is any storage left. If there is,... What rom do you flash with?
Addition: i had a similar problem and i couldnt instal 4.4.4, i did first inst...
And my benchmark. Btw, thats my first poste ever on Xda, chwcking forum for over a year now.
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