Very nice work and thank you for share it! can you post your module underhttps://xoops.org/modules/news/submit.php ? i think more XOOPS users can so adept about the MyTube module.
Also, last month I changed hosting provider. Could it be because of php5?
I think here is your problem ... Many old modules versions don't work with php5 and XOOPS 2.0.16 is also very old. Check the modules and upgrade to xoops-2.3.3 ...
please install a new XOOPS version, activate the debug mode and repeat the install from the XOOPS modul. i think you don't have install the XOOPS framework.