You probably need to look at the log files for the Webi Processing and Job servers to get more information - WIS 30270 is a "generic" error that comes up when the system doesn't know what the error really is.
Also, "Object could not be scheduled within the specified time interval" generally means that you don't have the capacity in the Job Server for the number of Webi schedules that you're trying to run and you have some long-running reports. I would go to the properties of the Adaptive Job Server, scroll down to find the Web Intelligence Job Server, and increase the number of concurrent jobs to 10. You might also have to add a Web Intelligence Processing Server to the system to support his, but only if you have enough RAM to handle another one.
-Dell