[R] lmer p-values for fixed effects missing

[UKaraoz]

I am trying to replicate the repeated measures example from Dr.Faraway's book
(Extending the linear model with R) as follows:

data(vision)
vision$npower <- rep(1:4,14)

mmod <-lmer(acuity~power+(1|subject)+(1|subject:eye),vision)


When I look at the fixed effects p-value, it is missing. Am I missing
something here?
Thanks.

Fixed effects:
            Estimate Std. Error t value
(Intercept) 112.6429     2.2348   50.40
power6/18     0.7857     1.5400    0.51
power6/36    -1.0000     1.5400   -0.65
power6/60     3.2857     1.5400    2.13


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