Designing SINC3 filter using matlab simulink

Hi,

We were trying to simulate sinc3 filter in matlab simulink. As you may know, sinc3 filter consists of 3 integrators followed by 3 differentiators. Each integrator & differentiators are designed using a DFF and a summer. We have modeled it in simulink, but while trying to run it, we are getting some error. Attached is the screenshot of circuit & error.

Please help us solve it.

Thanks in advance for all replies.

Regards,
abdj

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