problem whit RTDX 'Timed out waiting for CCS to confirm ...'

[kadjuv]

Hello every one
When I send data to the DSK through RTDX matlab shows me this error
"??? Write To RTDX Channel: Timed out waiting for CCS to confirm completion."
i work whit simulink (6.6) 2007a and CCS 3.1
this is what i do
>> ccs_obj = ccsdsp;
>> r = ccs_obj.rtdx

RTDX channels : 0

>> usesrtdx = isrtdxcapable(ccs_obj)

usesrtdx =

1
>> r.open('data','w');
>> r.enable('data');
>> r.writemsg('data', int16(data))
??? Write To RTDX Channel: Timed out waiting for CCS to confirm completion.
>> r.set('timeout', 100);
>> r.writemsg('data', int16(data))
??? Write To RTDX Channel: Timed out waiting for CCS to confirm completion.

can u help me please