How to schedule refresh for next/prev week in a calendar work schedule

Hi,

I am working on a schedule with shapes and I am stuck on a problem. When I click on Next week on the calender it gives me an error. What I am trying to do is when clicked on next week it should show me a fresh calender without any data in "Site Works" section (E5:K8), and also when I click on Prev week, it should show me the already entered data. Attached code and worksheet for reference. Thanks for looking into it.

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