I am having trouble simulating a FSK system. I have implemented it simulink and am unable to figure out what mistake I am making?

I am trying to study the behavior of non coherent fsk modulation and demodulation using simulink. I am including the model file that I created. Parameters used :

1. No of samples=40, Symbol time = 1e-6, sample time = Symboltime/no of samples
2. EbN0 = 10 db Frequecy spacing = 2*pi/symboltime carrier frequency = 10*frequecy spacingThe problem is when I try to see the output on the scope, the scope is empty. What am I doing wrong here? Please help me because I am new at simulink and wish to learn it very much. Thank you in advance.