Cannot Run Commands In A While Read Line Do Loop

I am looping through a file and then want to run some commands. Below is my code.

cat $PATHNAME | while read line;
do
PATH=$line
ls -t $PATH/javacore* >$NDIR
diff -w $ODIR $NDIR > $CHGS
done
This is the error I get.
./java_snap_monitor.sh: line 13: ls: command not found
./java_snap_monitor.sh: line 14: diff: command not found


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