WoWInterface - Button:Click() not avaible?

title says all ...

I have 2 SecureActionButton - Button2 is ontop (
[Front]
Button2
-------
Button1
[Back]
) of Button1 ... if a boolean-value matchs he should click button1 and run a script, if the boolean-value doesn't match he should click button2

so i have

Code:

Btn2:SetScript("OnClick", 

        function(self, button, down)

                if BOOL then

                        --Do something

                else

                        Btn1:Click(1,true)

                end

        end)

So if i run the addon with this ... i get the following error:

"Addon has been blocked from an action only avaible to the Blizzard UI. You can disable this addon and reload the UI."

Is there anything i do wrong oO?

**Solved in IRC, thanks Iriel :)**