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Hiya Monika,
fyi, I'm not sure when I became a member of the lexikon development team, but that's ok :)
I would completely, totally and utterly IGNORE that error message :)
Xoops is changing in many ways, and the code is one of them. The error message you are seeing is more or less directed to module and other developers to let them know not to use that function any more.
Hope that helps :)
Catz