The reason is Oracle cssd daemon process was not running.
As Root User :
Step 1: Go to the /etc folder
Step 2: Execute the following command.
# init.cssd start
startup will be queued to init within 30 seconds
Step 3: Wait for 2 minutes and execute the following commands
# cd $ORACLE_HOME/bin
# ./localconfig delete
Failure in CSS initialization opening OCR.
Shutdown has begun. The daemons should exit soon.
Step 4: Execute the following command
# ./localconfig add
Successfully accumulated necessary OCR keys.
Creating OCR keys for user root, privgrp ‘system’
Configuration for local css has been initialized.
Adding to inittab
Startup will be queued to init within 30 seconds
Checking the status of new oracle init process..
Expecting the CRS daemons to be up within 600 seconds
CSS is active on these nodes
CSS is active on all nodes
Oracle CSS service is installed and running under init(1M)
Step 5: Start the ASM instance now.