'editAreaLoader' is undefined

[see]

Hello,

Error when trying to open/create a template
Browser: IE8, Editor: JCE or Tiny MCE , Joomla 1.5

Full Error:
Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; InfoPath.1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
Timestamp: Thu, 3 Sep 2009 08:45:16 UTC

Message: 'editAreaLoader' is undefined
Line: 127
Char: 2
Code: 0
URI: ************/administrator/index.php?option=com_easytemplate&task=edit&bid=2

Many thanks

See