Generating new database context gives error (UnsatisfiedLinkError exception loading native library:

Generating new database context file as part of R12.2 upgrade gives below  error when perl adbldxml..pl is executed 

-bash-3.2$ perl adbldxml.pl 

Starting context file generation for db tier..

Using JVM from /u01/oracle/ERP/db/tech_st/11.2.0/appsutil/jre/bin/java to execute java programs..

APPS Password: 

The log file for this adbldxml session is located at:

/u01/oracle/ERP/db/tech_st/11.2.0/appsutil/log/adbldxml_11201201.log

UnsatisfiedLinkError exception loading native library: njni11

java.lang.UnsatisfiedLinkError: /u01/oracle/ERP/db/tech_st/11.2.0/lib/libnjni11.so: /u01/oracle/ERP/db/tech_st/11.2.0/lib/libnjni11.so: wrong ELF class: ELFCLASS64 (Possible cause: architecture word width mismatch)