My validators are not working

This was working 

<asp:RequiredFieldValidator ID="RequiredFieldValidator7" runat="server" ForeColor="Red" ErrorMessage="* This field cannot be blank." ControlToValidate="FunctionGroup">
</asp:RequiredFieldValidator>

...

<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ForeColor="Red" ErrorMessage="* This field cannot be blank." ControlToValidate="FunctionGroup">
</asp:RequiredFieldValidator>


As soon as I changed it to 

<asp:RequiredFieldValidator ID="RequiredFieldValidator7" runat="server" ForeColor="Red" ErrorMessage="* This field cannot be blank." ControlToValidate="FunctionGroup">
</asp:RequiredFieldValidator>

...

<!--

<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ForeColor="Red" ErrorMessage="* This field cannot be blank." ControlToValidate="FunctionGroup">
</asp:RequiredFieldValidator>

 -->

it stopped working. So if you don't want to use validator, instead of commentting out it, delete it.