Complex signal mismatch

I was running a simulation using De-modulator placeholder to simulate DTMF but I received error message that the receiver expecting signal type real but is being drive by signal type complex. Please any suggestion.

Answer 1

[Walter Roberson]

The following discussion may be of assistance: http://www.mathworks.com/matlabcentral/answers/28718-simulink-embedded-function-detects-phantom-complex-value