sqlplus: cannot execute binary file

We are doing cloning on HP-UX systems where server 1(Source system is HP-UX server1 B.11.23 U ia64)                                                                 and server 2(Target system is HP-UX server2 B.11.11 U 9000/800) both are 64 bit.
After sourcing the environment for database 10gR2. Getting error like below.

export ORACLE_SID=SID
export ORACLE_HOME=ORACLE_HOME_PATH
export PATH=$ORACLE_HOME/bin:$PATH:.
export LD_LIBRARY_PATH=$ORACLE_HOME/lib:$PATH:.

sqlplus "/as sysdba"
sqlplus: cannot execute binary file

Any help would be appreciated