Error on TASK trigger by an Event

Hi,

I create task with triggering event from object BASICPAY event Request.

When I check using tcode SWEL I get green icon but with error like this:

EventData

Event Instance ID 377

Object Type BASICPAY

Object Key 000000110 X9999123120100305000

Event REQUESTED

Event Creator US ADMIN-XXXXXX

Creation Time 06.05.2010 15:51:58 UTC+7

ReceiverData

Receiver Type TS90000001

Object Key

Receiver FM SWW_WI_CREATE_VIA_EVENT_IBF

RFC Destination WORKFLOW_LOCAL_160

Check FM

Receiver Type FM

Message Runtime error DYNPRO_SEND_IN_BACKGROUND has occurred

Tracedata

Trace Date/Time 06.05.2010 15:51:58 UTC+7

User Name ADMIN-XXXXX

Main Program MP000800

Action Receiver started correctly.

When I check using SWI1 there is no workflow log for my task.

And there is no workitem in the user inbox.

Regards,