Hello, running J 1.5.3

I used to have the old 1.1 AllVideos reloaded MODULE, and it was all I needed, but they have released a full component and I wanted to try one of the new features.

I uninstalled old Module,

Then installed full new 1.2 Component.

It didn't work at all, no matter what I tried, so I uninstalled the whole thing, even going into the DB and removing all the AVR tables,

But now, whenever I go to edit or create a story, I get this Fatal error:

Fatal error: Call to undefined function: ondisplay() in xxxx..../libraries/joomla/html/editor.php on line 263

Is there a way to fix this? I tried overwriting that file, the editor.php, with a fresh one, but it gave the same error.

The site itself seems to be functioning normally:  bluegravitysurf.com

I have found that on the plugin page, I cannot remove the AVR plugin, it will give me this error:

Plugin Uninstall: Manifest File invalid or not found
Message
Uninstall Plugin Error