Message file sp1<lang>.msb not found ERROR

Please take a look at my .profile

/**** .profile *******/
PATH=/usr/bin:/etc:/usr/sbin:/usr/ucb:$HOME/bin:/usr/bin/X11:/sbin:.:/usr/local/                                                                              bin

alias sqlplus='/u01/app/oracle/product/rdbms/10.2/bin/sqlplus'

export ORACLE_HOME=/u01/app/oracle/product/rdbms/10.2
export PATH=$ORACLE_HOME/bin:$PATH
export LD_LIBRARY_PATH=$ORACLE_HOME/lib
export LIBPATH=$LD_LIBRARY_PATH
export ORACLE_SID=xmodelp1

if [ -s "$MAIL" ]           # This is at Shell startup.  In normal
then echo "$MAILMSG"        # operation, the Shell checks
fi                          # periodically.

/*********End of .profile *********/

When I am running sqlplus i am getting the following error.

$ sqlplus
1085648 : map : Permission Denied
1085648 : map : Permission Denied
1085648 : map : Permission Denied
Error 6 initializing SQL*Plus
Message file sp1<lang>.msb not found
SP2-0750: You may need to set ORACLE_HOME to your Oracle software directory

Please suggest.
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