[BioC] AWS cluster not finding installed R packages

[John [guest]]

I'm building an aws cluster with bioconductor and I have to install some packages from CRAN prior to the start of the run. I'm using doSNOW for the parallel tasks. When I start the run I receive the error... "X Package not found" where X  is my installed packages. If I run on a single multicore system this error is not received. 

I tried logging into each node and installing locally but I still receive the same error. 

Any ideas? 
Thanks

 -- output of sessionInfo(): 

"X Package not found"

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