[R] Problem with lmer and fixef

[swertie]

Hello,
I am trying to do contrasts after applying a binomial mixed effect model
with the function lmer. I have to extract the fix effect values, but as I
write fixef(model), I get this error message:  

Error in UseMethod("fixef") : 
no method for 'fixef' with objects of class "mer" 

Has anybody some ideas why? And how can I then post-hoc testing my data if I
cannot do the contrasts?

Thank you very much

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