When using Reporting Services reports in SharePoint and at the same time changing the debug attribute to true in web.config the following error message might appear in a web browser alongside the Reporting Services reports not behaving properly:
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; .NET4.0C; .NET4.0E; .NET CLR 3.5.30729; .NET CLR 3.0.30729; InfoPath.3)
Timestamp: Thu, 14 Oct 2010 10:01:21 UTCMessage: Sys.ArgumentNullException: Value cannot be null.
Parameter name: panelsCreated[x]
Line: 129
Char: 12
Code: 0
URI: http://servername/ScriptResource.axd?d=somethingcomplicated…
Changing the following attribute in the correct web.config will remedy the problem, however the debugging opportunities will take a hit…
<compilation optimizeCompilations="true" batch="false" debug="false">