I’m getting this error by clicking on a eventcategory where the event is placed:
Warning: in_array() [function.in-array]: Wrong datatype for second argument in /wp-includes/post-template.php on line 1039
I’ve found this quote in an other supportforum:
<blocknote>
The PHP warning means that $_current_page->ancestors does not have a datatype of ‘array.’
What changes had you recently made to the site right before it broke?
</blocknote>
In the other forum… There wasn’t a fix.