Error in Mangolassi Chat

[Lakshmana]

When I am chatting with the ML,the error shown below comes.Why?
The error comes while I hit enter the message to the other
Error
[sounds] Not found: waterdrop-low.wav

[gjacobse]

Sounds? Interesting.. I've never heard sounds from ML or ML chat....

[scottalanmiller]

@gjacobse said:

Sounds? Interesting.. I've never heard sounds from ML or ML chat....

I get OS alert sounds but there are not supposed to be any sounds here, the sound module is not even installed.