OPATCHAUTO-72115: Please complete the previous apply session across all nodes to perform apply session

Problem:

My opatchauto outofplace patching failed on GI home. I was able to cleanup cloned GI home and information about it in inventory.xml, but after running opatchauto again I was getting the following error:

[root@rac1 29708703]# $ORACLE_HOME/OPatch/opatchauto apply -oh $ORACLE_HOME -outofplace
OPatchauto session is initiated at Sun Aug 18 20:40:43 2019
System initialization log file is /u01/app/18.3.0/grid/cfgtoollogs/opatchautodb/systemconfig2019-08-18_08-40-46PM.log.
Session log file is /u01/app/18.3.0/grid/cfgtoollogs/opatchauto/opatchauto2019-08-18_08-42-20PM.log
The id for this session is Z1CP
OPATCHAUTO-72115: Out of place patching apply session cannot be performed.
OPATCHAUTO-72115: Previous apply session  is not completed on node rac1.
OPATCHAUTO-72115: Please complete the previous apply  session across all nodes to perform apply session.
OPatchAuto failed.

Solution:

Clear checkpoint files from the previous session :

[root@rac1 29708703]# cd /u01/app/18.3.0/grid/.opatchauto_storage/rac1
[root@rac1 rac1]# ls
oopsessioninfo.ser
[root@rac1 rac1]# rm -rf oopsessioninfo.ser 

Rerun opatchauto apply again.