in log viewer there is a lot of scheduler exception, scheduler event failure, 

in one this items create 60 page in log-viewer page. 

i past the error below

THREAD ID:32 TYPE:DotNetNuke.Services.Social.Messaging.Scheduler.CoreMessagingScheduler, DotNetNuke EXCEPTION:Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression. The statement has been terminated. RESCHEDULED FOR:4/30/2014 11:59:50 PM SOURCE:STARTED_FROM_BEGIN_REQUEST ACTIVE THREADS:0 FREE THREADS:1 READER TIMEOUTS:0 WRITER TIMEOUTS:0 IN PROGRESS:0 IN QUEUE:8

please help to figure out this issue!