'System.InvalidCastException when i try to launch my page

            <%if ((bool)Session["admin"] == true) { %>
            <li><a href="UsersData.aspx">Users Data</a></li>
           <% }%>

for some reason when it gives me the System.InvalidCastException even though it works for my teacher (we have the exact same thing since she is teaching my class html) what can i do?

html


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