Vaadin shows “Message: Object doesn't support this property or method” with

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Whenever I compile a Widgetset with Vaadin 6.5.6 or 6.5.7 in Eclipse and then run the application it only works in firefox and safari. IE always gives :

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C)
Timestamp: Fri, 29 Apr 2011 16:45:28 UTC

Message: Object doesn’t support this property or method
Line: 2860
Char: 445
Code: 0

:upon loading. Does anyone know why?