ODS activation Error

Hi:

I loaded data in ODS and while trying to activate, I am getting following error.

<b>"Value '!0.41mg/m3 ' (hex. '21302E34316D672F6D33 ') of characteristic ZPHRSTXT1 contains invalid char "</b>

I think it because of invalid charcater "!" in incoming data. How can I avoid this and activate ODS.

thanks