Make sure you are not using the XOOPS DB for Meta Tags.
Change line 61 in the include/metatags.php file to read
$v2014 = ((XOOPS_VERSION == 'XOOPS 2.0.14')||(XOOPS_VERSION == 'XOOPS 2.0.15')||(XOOPS_VERSION == 'XOOPS 2.0.16'));
Warning: MyTextSanitizer::makeTboxData4Show is deprecated in file /class/module.textsanitizer.php line 575
Kernel Deprecated Functions
Now the old ones, with the correct equivalent:
* function makeTboxData4Save($text)
* function makeTareaData4Save($text)
--> $ts->addSlashes($text);
$ts->addSlashes($text);