Hi Lee,
The sine wave source blocks are the ones that specify the sample time of the model, all the other blocks in the model just inherit the sample time. Since these blocks were removed it's necessary to specify the sample time in any of the other source blocks - for example just open the parameters dialog of the Constant5 block and set the 'Sample time' field to something different than -1 (eg. 1e-6). Sample times are specified in seconds, to have accurate time scales in data plots and accurate frequency scales in FFT plots it is recommended that the sample time is set to 1 / sampling_frequency.
Regards,
Andrei