Code:
L 07/29/2015 - 07:20:11: [SM] Native "PbSetInt" reported: Invalid field "msg_dest" for message "CCSUsrMsg_TextMsg"
It probably means that msg_dest is not a valid field for CSGO's TextMsg message.
Try not to use PbSetInt(..., "msg_dest", ...) anymore. We must figure it out somehow, about what fields we need for CSGO's TextMsg message.