I have a local NNF install working fine inside MAMP. After uploading everything to the remote server I received two errors at the same time.
_Warning: DOMDocument::loadXML(): Namespace prefix gcse on search is not defined in Entity, line: 86 in /home/public/lib/domtemplate/domtemplate.php on line 54:_
[GCSE = Google Custom Search Engine)
After searching I found that —-> *<gcse:search></gcse:search>*
could be modified into —-> *<div class="gcse-search"></div>*
So this first error is solved.
_Warning: Invalid argument supplied for foreach() in /home/public/lib/domtemplate/domtemplate.php on line 449._
The local install with MAMP (PHP 7.0) is ok without errors.
The remote server (PHP 5.5/5.6/7.0) is always throwing that error, except for the main index forum page.
What should I check at this point?