Event Deactivated - Error

Question: I have set up a change document in SWEC for DEBI on business object KNA1 customer event ZChanged.

When I make a change to a Customer the event triggered but errored and deactivated.
The WF Administrator received the following message :

Error processing following event linkage:
KNA1 ZCHANGED WS90100026

Following error occurred:
OL 356
_SWT_TRACE_HANDLE

Message text:
Element _SWT_TRACE_HANDLE is not available in the container


Can anyone tell me what this means and how to fix it ?
Is there any extra config. I need to do ?

Many Thanks

Answer:
Fixed it. Basic mistake.
Forgot to bind event initiator.

Answer:
What exactly means binding event intiator and how it's done?

I'm having same problem
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