Invalid PM message

[ADWest]

I am trying to send a PM to another a getting the system response of "invalid message." I took out all puntcuation and capital letters, still get the same message.
Why?

 

[VHinch]

I am trying to send a PM to another a getting the system response of "invalid message." I took out all puntcuation and capital letters, still get the same message.
Why?

Most likely reason is the user has his privacy settings set to not accept PM's.