( ! ) Fatal error: Cannot redeclare class MediaWiki_I18N in plWąU on line 34
Call Stack
#	Time	Memory	Function	Location
1	0.0000	234192	{main}( )	.../index.php:0
2	0.0203	3635968	MediaWiki->run( )	.../index.php:61
3	0.0204	3636600	MediaWiki->main( )	.../Wiki.php:501
4	0.1105	5497264	MediaWiki->finalCleanup( )	.../Wiki.php:592
5	0.1105	5498064	OutputPage->output( )	.../Wiki.php:405
6	0.1109	5521840	ContextSource->getSkin( )	.../OutputPage.php:1989
7	0.1109	5522008	RequestContext->getSkin( )	.../ContextSource.php:154
8	0.1109	5522184	Skin::newFromKey( )	.../RequestContext.php:348
9	0.1121	5526624	include_once( '/usr/share/mediawiki/skins/Vector.deps.php' )	.../Skin.php:153