AX 2009 enterprise portal -- Sys.ArgumentNullException error

While testing one of the controls in enterprise portal one of my team-mate got this error. In this scenario he got it after clicking on the ax date control to choose a date. This error was coming most of the time except for the first when the page was opening. The error is associated with date control. The detailed error is as follows:



User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.5.21022; .NET CLR 3.5.30729; .NET CLR 3.0.30729; MS-RTC LM 8; InfoPath.2)

Timestamp: Mon, 31 Jan 2011 10:11:33 UTC

Message: Sys.ArgumentNullException: Value cannot be null.
Parameter name: panelsDeleting[7]
Line: 4723
Char: 21
Code: 0
URI: http://AXDev/ScriptResource.axd?d=BbXpLQ1o3AIdHtS9ypBQfYDbdhpQLYX3HwkftdXT3c85Pz79UWU7kN5H85iLIwwP4D2wY1XbQFNNAZH_mWXc22MaLkqOGf2gE11PwTELiSg1&t=4ca27158

Usually in order to debug code in enterprise portal we change  the property debug = true from the standard false in Web.config file. The complete standard value is  <compilation batch = "false" debug="false"> .

This is the solution, making debug= false and then a IISRESET comand will resolve the issue.