OpenMx General Help

There seems to be a problem with how OpenMx and Xgrid interact. I have three machines on my Xgrid, each of which has no problem running OpenMx. After submitting jobs, the R scripts come back with the following errors:

> require(OpenMx)
Loading required package: OpenMx
Loading required package: snowfall
Loading required package: snow
Error in dirCreateStop(.sfOption$RESTDIR) :
UNABLE to create directory: /var/empty/.sfCluster/restore
In addition: Warning message:
In dir.create(dir, recursive = TRUE) :
cannot create dir '/var/empty/.sfCluster', reason 'Permission denied'