500 - JHtmlBehavior::mootools not found.

[deleted user]

During the upgrade, the 2.5 version of JHtml (stored at libraries/joomla/html/html.php) should be deleted and the version at libraries/cms/html/html.php should be used post-upgrade. Assuming that part has happened correctly, if you have an extension that is still calling the JHtmlBehavior::mootools method (which you can verify is not in the correct version of the JHtml class), then that extension is not compatible with Joomla 3 and the error message you're receiving is an indicator of that.

[cowboysdude]

During the upgrade, the 2.5 version of JHtml (stored at libraries/joomla/html/html.php) should be deleted and the version at libraries/cms/html/html.php should be used post-upgrade. Assuming that part has happened correctly, if you have an extension that is still calling the JHtmlBehavior::mootools method (which you can verify is not in the correct version of the JHtml class), then that extension is not compatible with Joomla 3 and the error message you're receiving is an indicator of that.

The only extensions that are installed on my backup are Kunena and Akeeba nothing else except Joomla issued files are on my backup. SO at the moment I have made a sub dir off of my live site and am currently installing a fresh copy of joomla with nothing else installed and am going to do the backend joomla update to see if that works.

I can find no other explanation for this...

So you're telling me that after the upgrade I need to go in and delete files and the version of files from the other dir copied? Not really clear..

[deleted user]

Joomla should delete the old file as part of the upgrade process. If it's still there, that's an indicator that something went wrong during the upgrade. Usually for file deletion issues, it's an issue with filesystem permissions. Does the web user have write access to the filesystem?

[lu35]

Hi all,
During upgrading from 2.5 to 3.4 a solution I found for "500 - JHtmlBehavior::mootools not found." is to change the default template to a 3.4 compatible one. Don't know where I found it (I've did a lot of searching for a lot of errors during upgrading) but I thank the person who posted it. Maybe this helps anyone.
Regards.

[ScottSenffner]

the Gcalendar was my problem with the site.

Thanks for your help!