Messages - Send To

Hi Team,

Thanks for the great support so far. I have installed the BP Social theme and have an issue with send messages.

When putting letters in the "Send To" box instead of pulling up members names to match those letters I get a series of error message under the name (I have only included one as they all pertain to the header)

Warning: Cannot modify header information - headers already sent by (output started at . . . . )

What can I do to get rid of the error and have the functionality work properly?