Clicking Select All in this HTML window

Help Everyone,

I have VBA code to open up the report picture as shown below, it will select ERX IE WORKFUSION HOA from the first drop-down list, click View Report (as that is the only way to show the options in the User drop-down box), and then I want it to select "Select All" from the User list. Unfortunately, the User list is not created the same way in HTML as the User Group one, so I cannot mimic what I've done there.

I am getting a Run-time error 91: Object variable or With block variable not set error on the following line near the bottom .document.getelementbyId("ct132_ct104_ct107_divDropDown_ct100").Click

Code