Object Expected Error Javascript Asp Net

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Invalid Operand To 'in' Object Expected Jquery

button and I always get "Microsoft JScript runtime error: Object expected" error. I have tried all of the following (all with the same results): $('#btnCompleteHidden').click();or: $('#btnCompleteHidden').trigger('click');With plain JavaScript: document.getElementById('btnCompleteHidden').onclick(); $('#<%=btnCompleteHidden.ClientID %>').click();Or: document.getElementById('<%=btnCompleteHidden.ClientID %>').click(); I have tried making the button visible and still the same results. I will post the aspx page here: