Send error on xdot

Hi,
my system is peer to peer with 3 slaves and 1 master. And if one slave has this error (MDOT_TX_ERROR = -2) after trying to send a message to the master then it will not be able to send again! What can I do in order to send again? =>clear this error? And why i got a send error?

I used this without success:

status = _dot->send(SendVector, false);
if (status == mDot::MDOT_OK) //
{
….
_dot->recv(data);
}
else
{
if (_dot->getSerialClearOnError()) //8dec16
SendVector.clear();
}

Thx for your response!!