This error is usually caused by a line in in your .bashrc or .bash_private that contains a module use or module load command. The error message should tell you exactly where it is. It comes from the fact that the module command is not available on the access node. So you should see it every time you log into access, but not on the computing nodes.

To get rid of it, you can either prefix each use of the module command in any .bash… with

command -v module >/dev/null 2>&1 &&

or you use an explicit if block around them:

if command -v module >/dev/null 2>&1; then
	module use $RESIF_ROOTINSTALL/core/modules/all
	module use $RESIF_ROOTINSTALL/lcsb/modules/all
fi