R-help: insufficient space problem occurred during inversion of sparse matrix

Hi everyone,

I have one problem with sparse matrix(package "SparseM"). I tried to  
inverse a sparse matrix with solve function in SparseM package. But I  
got warning:Error in .local(x, ...) : insufficient space.

p=solve(coeff,tmpmax=120*nrow(coeff))

Error in .local(x, ...) : insufficient space

I read the manual and also google a lot and I did not find useful  
information so far. PS: I have increased the limited memory in R  
already.

Anyone can provide suggestion on this problem?

Thanks