This page doesn't seem to exist

I have a userlevel structure level0 to level4.
My Welcome page and the Member Option page have are constructed both with a similar structure as follows:

[s2If current_user_is(s2member_level4)]
. . . Events ankündigen.
[/s2If]

[s2If current_user_is(s2member_level3)]
. . . Befragungen erstellen.
[/s2If]

[s2If current_user_is(s2member_level2)]
. . . Quizze und Umfragen erstellen.
[/s2If]

[s2If current_user_is(s2member_level1)]
. . . an Befragungen teilnehmen.
[/s2If]

[s2If current_user_is(s2member_level0)]
. . . als registrierter Benutzer an Quizzen und Umfragen teilnehmen.
[/s2If]

As a user with role level0 everything is ok.
The page shows me
. . . als registrierter Benutzer an Quizzen und Umfragen teilnehmen.

But as user with role level1 or higher wordpress doesn’t find the page, my browser sends me:

This page doesn't seem to exist.
It looks like the link is broken. 
Start a search?

Can anyone tell me what is wrong with the above structure?

best regards,
franzl