[R] error in comparisons using glht function

[paola]

hi everybody

this is my last chance, I dont know what else to do 
I was trying to find my multiple comparisons using the code in R glht
next is my function and the error I get


vol.interallaovsol<-aov(scoresol~ffjob+ffage+ffstudies+ffjob:ffstudies+ffjob:ffage+ffstudies:ffage+ffjob:ffage:ffstudies,data=vol18.df)
> vol.mcsol<-glht(vol.interallaovsol, linfct=mcp(ffage="Tukey"))
Warning messages:
1: In mcp2matrix(model, linfct = linfct) :
  covariate interactions found -- default contrast might be inappropriate
2: In glht.matrix(model = list(coefficients = c(4.83, -0.884666666666668,  :
  157 out of 210 coefficients not estimable in ‘model’

 I dont have a clue what is this.
Any idea??thanksssssssssssssssssssss



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