Unexpected non-MediaWiki exception encountered, of type &quot;TypeError&quot;<br />
TypeError: implode(): Argument #1 ($separator) must be of type string, array given in /home/bsbi/herbarium/htdocs/wk/languages/Language.php:2017<br />
Stack trace:<br />
#0 /home/bsbi/herbarium/htdocs/wk/languages/Language.php(2017): implode()<br />
#1 /home/bsbi/herbarium/htdocs/wk/includes/GlobalFunctions.php(1025): Language-&gt;pipeList()<br />
#2 /home/bsbi/herbarium/htdocs/wk/includes/QueryPage.php(349): wfViewPrevNext()<br />
#3 /home/bsbi/herbarium/htdocs/wk/includes/specials/SpecialWantedcategories.php(90): QueryPage-&gt;doQuery()<br />
#4 /home/bsbi/herbarium/htdocs/wk/includes/SpecialPage.php(772): wfSpecialWantedCategories()<br />
#5 /home/bsbi/herbarium/htdocs/wk/includes/SpecialPage.php(560): SpecialPage-&gt;execute()<br />
#6 /home/bsbi/herbarium/htdocs/wk/includes/Wiki.php(230): SpecialPage::executePath()<br />
#7 /home/bsbi/herbarium/htdocs/wk/includes/Wiki.php(60): MediaWiki-&gt;initializeSpecialCases()<br />
#8 /home/bsbi/herbarium/htdocs/wk/index.php(116): MediaWiki-&gt;initialize()<br />
#9 {main}<br />
<br />
#0 /home/bsbi/herbarium/htdocs/wk/languages/Language.php(2017): implode()<br />
#1 /home/bsbi/herbarium/htdocs/wk/includes/GlobalFunctions.php(1025): Language-&gt;pipeList()<br />
#2 /home/bsbi/herbarium/htdocs/wk/includes/QueryPage.php(349): wfViewPrevNext()<br />
#3 /home/bsbi/herbarium/htdocs/wk/includes/specials/SpecialWantedcategories.php(90): QueryPage-&gt;doQuery()<br />
#4 /home/bsbi/herbarium/htdocs/wk/includes/SpecialPage.php(772): wfSpecialWantedCategories()<br />
#5 /home/bsbi/herbarium/htdocs/wk/includes/SpecialPage.php(560): SpecialPage-&gt;execute()<br />
#6 /home/bsbi/herbarium/htdocs/wk/includes/Wiki.php(230): SpecialPage::executePath()<br />
#7 /home/bsbi/herbarium/htdocs/wk/includes/Wiki.php(60): MediaWiki-&gt;initializeSpecialCases()<br />
#8 /home/bsbi/herbarium/htdocs/wk/index.php(116): MediaWiki-&gt;initialize()<br />
#9 {main}<br />