Visible code error

[Malindra]

I created five buttons on the top of my form to be a
nevigation bar and also created one subform(1) which
contain another subform(1.1) in it.

I have an error when I try to click on navigation bar in
order to set visible on subform(1.1) to be false and
visible main subform(1).

Is there anyway that I can avoid this problem?

Best regard,
Malindra

Main form
Subform(1)
Subform(1.1) this is under subform(1)