Database error

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A database query syntax error has occurred. This may indicate a bug in the software. The last attempted database query was:
(SQL query hidden)
from within function "MediaWikiBagOStuff:_doquery". MySQL returned error "1062: Duplicate entry 'netipedia:messages:Sitenotice' for key 'keyname' (localhost)".
Retrieved from "http://www.netipedia.com/index.php/Wikipedia:Dewey_Decimal_System/0/00/000"