The following tips relate to the C1ReportScheduler application.
When scheduling a report in client mode using C1ReportScheduler, you may get an error that the XML is not found. That's because the XMLl file is accessed from the mapped drive. Standalone mode is able to run successfully because in standalone mode the local user account is used by the C1ReportsScheduler service which can easily access the network locations. But when the mode is switched to client mode the network locations are not accessible because the service account used to access the file might not have the right to access the network location.
In order to remove the problem you'll need to do following:
The error should not occur after this.