error on backend

in my browser when in the backend it has an yellow error icon. here is the error message. also the module contents aren't showing on the page i have this assigned to.

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; InfoPath.2)
Timestamp: Wed, 25 May 2011 21:37:06 UTC


Message: Unknown runtime error
Line: 149
Char: 3
Code: 0
URI: http://www.all-import.com/modules/mod_n ... /script.js


Message: Object doesn't support this property or method
Line: 59
Char: 102
Code: 0
URI: http://www.all-import.com/media/system/js/mootools.js