This is a pretty generic exception. I thought I would post this note as my searches for a solution were not very helpful.
In my case the error was due to a recurring deadlock due to a missing database option for Read Committed Snapshot on this new subscriber database.
Turning on Verbose Logging revealed: System.Data.SqlClient.SqlException: Transaction (Process ID 89) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.
Adding this to RsReportServer.Config (remove comments) did the trick.
<!-- <system.diagnostics>--><!-- <switches> -->
<!-- <add name="DefaultTraceSwitch" value="4" />-->
<!-- </switches> -->
<!-- </system.diagnostics>-->
...Ray