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Pligg Support

Hi, i am new and pligg. Today i install pligg in my site, but in the log show this errors:

[20-Mar-2014 05:26:11] PHP Warning: Table '****_pligg.pligg_files' doesn't exist in /*********/libs/db.php on line 479

How can i fixed?
Is there any documentation about pligg?