[R] plm package twoways effect problem

[seral]

Hello everyone,

I have a peoblem to create the twoways effect in the plm package.


when i try to create the following

dsn1<-plm(lnQ~lnC+lnL+lnM+lnE+eco+RD,data=newdata,effect="twoways",model="within")

 i have this error:

Error in rep.int(c(1, numeric(n)), n - 1L) : negative length vectors
are not allowed


and to be honest i have no idea what does it mean!!  can someone give me any
idea what it would mean?

Thank you for your help in advance 
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