Can’t call method “uid” on an undefined value at …DBUtilServices.pm line 28.

Problem:

opatchauto on GI fails with the following error:

# /u01/app/18.0.0/grid/OPatch/opatchauto apply /0/grid/29301682  -oh /u01/app/18.0.0/grid
 Can't call method "uid" on an undefined value at /u01/app/18.0.0/grid/OPatch/auto/database/bin/module/DBUtilServices.pm line 28.

Reason:

1. GI is not setup yet. You may have unzipped GI installation file, but have not run gridSetup.sh
2. $GI_HOME/oraInst.loc is missing.

Solution:

1. Setup GI by running gridSetup.sh
2. Copy the oraInst.loc from the other node, if you don’t have another node then please see the file content bellow:

# cat /u01/app/18.0.0/grid/oraInst.loc
inst_group=oinstall
inventory_loc=/u01/app/oraInventory