Dear Doaa,
you need to make sure that the signal output of the Matlab component is correctly set (optical , electrical, binary or M-ary) in the component properties popup window. In your case, when you need to connect the output of the Matlab component directly to the BER analyzer, it needs to be electrical. You need to provide also the binary and the pulse signal to the BER to work.
I hope this helps.
Please note that you can’t upload OptiSystem files to the forum.
Regards,
Ahmad