Duplicate Power Knockback Bug

I was playing around on my SE mule when i hit power knockback button. I got DCed immediately n got the error message:
Error Code: 5 (Access is denied)

recording of it:

Error Code SS:

 

I also tried on tat beginner bow thingy, ended up with the same error code

 

This has already been reported and fixed for the coming update, however I don't know what you mean with "beginner bow thingy", the actual "Beginner Bowman's Bow " shouldn't dc you.
Could you please clarify what you mean?

 

hmm apologies, i might have made a mistake about that. I believe i might have remembered using the wrong bow

 

Thanks for the clarification.
There are a few bows that all suffered from this problem, including the Akha bow, and they are all fixed for the coming update.