如何排除错误代码＆＃34; exc_bad_access（code = 1，address = 0x20）＆＃34;

Question

当我的应用执行类功能时，我遇到了问题。错误代码是：

  

＆＃34; EXC_BAD_ACCESS（码= 1，地址为0x20 =）＆＃34;

我的问题源代码是：

    <form id="form1" runat="server"> 
    <asp:ListBox ID="ListBox1" runat="server" SelectionMode="Multiple">
   <asp:ListItem Value="1">--Select--</asp:ListItem>
   <asp:ListItem  Value="2" ></asp:ListItem>
    <asp:ListItem  Value="3" ></asp:ListItem>
   <asp:ListItem  Value="4" ></asp:ListItem>
    </asp:ListBox>

        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="select listitems" 
            ControlToValidate="ListBox1" InitialValue="" EnableTheming="True" ForeColor="#FF3300" ViewStateMode="Enabled">

        </asp:RequiredFieldValidator>

         <asp:Button ID="btnSubmit" runat="server" Text="Submit" />
    </form>

Here is the screenshot of the Xcode, when the app is broken

I have added the Zoombie object option to check if there is any further findings, but no difference when the app is broken

有人可以建议我如何解决这个问题？