lmer - computational error in lmerTest even with ham-data -

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lmertest did not return p-values of own model; tried reproduce example manual - 

m <- lmer(informed.liking ~ gender+information+product +(1|consumer), data=ham) # gives summary of lmer object. same of class mermod # additional p-values calculated based on satterthwates approximations  summary(m)

but message:

summary lme4 returned computational error has occurred in lmertest

and no p-values! what´s wrong?

thx in advance!


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