OPatch failed to locate Central Inventory/OPatch failed with error code 73

Solution:

The following problem was caused by our recent migration, the inventory was pointing to a home that was no longer on the server.

We need to attach the current home to the inventory, by using below command we can solve this issue.

$cd $OH/oui/bin

$ ./runInstaller -silent -invPtrLoc "/etc/oraInst.loc" -attachHome ORACLE_HOME="/u01/app/oracle/product/11.2.0.4" ORACLE_HOME_NAME="ORACLEHOME"
Starting Oracle Universal Installer...

Checking swap space: must be greater than 500 MB.   Actual 18432 MB    Passed
The inventory pointer is located at /etc/oraInst.loc
The inventory is located at /u01/app/oracle/oraInventory

'AttachHome' was successful.