I updated a module (home text editor/editorial) and I am now getting an internal server error. I turned error reporting on and I get something along the lines of Fatal error. Call to undefined method in editorial.php... line 301. When I look at line 301 it says

if (!$this->isCached('editorial.tpl', $this->getCacheId()))

I am using 1.5.2 and the upgrade I clicked on was highlighted in my back office, so I assumed it was compatible with this version. I hope someone can help me

 Thank you in anticipation