Could not initialize class coldfusion.runtime.report.Report

I have inherited an application that contains a number of reports. This application was developed on our CF7 server, and when we upgraded, the application was copied to 8, but not fully tested. Now, when we request the reports, we get the following errors (this is a Flex application):
(mx.rpc::Fault)#0
errorID = 0
faultCode = "Server.Processing"
faultDetail = (null)
faultString = "Could not initialize class coldfusion.runtime.report.Report"
message = "faultCode:Server.Processing faultString:'Could not initialize class coldfusion.runtime.report.Report' faultDetail:'null'"
name = "Error"
rootCause = (null)

My searching for a solution has not been successful on Google. Has anyone experienced this error and been able to fix it? I'm at a loss on what to do next, and as the app is in production, I have some upset clients over this.

Thanks!!

Jenn