Invalid pattern capture

[latchee]

Hi there,

Thank you for maintaining WIM :)
I play on Turtle Wow and use the addon
When I whisper @follow to my other toon, I get this error:

Interface\AddOns\WIM\WIM.lua:1233: invalid pattern capture

I am not sure if this is due to the @follow message I sent or the response for the toon. The response is:

Following you...lead on :)

Here is a screenshot of the error and my filtering configuration:

Would you know how to fix this?

Thx