Avamar SQL Cluster backups failed with log gap and sqlmeta.xml file

SQL incremental backups for a SQL Cluster or SQL AG fails with the following errors:
 

Line 542: 2019/12/05-16:49:56.85100 [avsql_assist]  avspawn::run_and_wait back from wait error_num:536870919 wait_error:0
	Line 547: 2019-12-05 17:49:56 avsql Warning <7427>: Error loading SQL metadata
	Line 555: avtar Error <5195>: Path ".system_info\sqlmeta" not found in backup. (Element 'sqlmeta' at position 1 in search path '.system_info\sqlmeta' not found)
	Line 634: 2019-12-05 17:49:57 avsql Error <40418>: Skipping database 'sql-listener\VIEWSQL/viewupdmgr' due to the following reason: A log gap was identified or a full backup was not found.
	Line 755: 2019/12/05-16:50:04.42799 [avsql_assist]  avspawn::run_and_wait back from wait error_num:536870919 wait_error:0
	Line 755: 2019/12/05-16:50:04.42799 [avsql_assist]  avspawn::run_and_wait back from wait error_num:536870919 wait_error:0
	Line 762: 2019-12-05 17:50:04 avsql Warning <7427>: Error loading SQL metadata
	Line 770: avtar Error <5195>: Path ".system_info\sqlmeta" not found in backup. (Element 'sqlmeta' at position 1 in search path '.system_info\sqlmeta' not found)
	Line 849: 2019-12-05 17:50:05 avsql Error <40418>: Skipping database 'sql-listener\VIEWSQL/viewevent' due to the following reason: A log gap was identified or a full backup was not found.

The log gap issue is caused due to the failure to read the sqlmeta.xml file from the previous SQL backups and the backups fail with sqlmeta.xml not found.

Please check the below steps:
1) Create c:\temp if it does not exist, run as admin while cd in Avamar BIN folder on the primary SQL Node: 

 avtar --list --debug --server=<Avamar_server> --id=MCUser --ap=MCUser_password --path=<path_to_client> --labelnum="91631" --noinfo --noconfig --logfile=c:\temp\backup_list.log
 
 where --labelnum="91631" is the backup label number.
 
 2) Check if the sqlmeta.xml file is present in the output from above command.
 
 If the file is present then try the restore of '.system_info' from the backup using below command:
     avtar -x --debug --server=<Avamar_server> --id=MCUser --ap=MCUser_password --path=<path_to_client> --labelnum="91631" --noinfo --noconfig ".system_info" --target=c:\temp\ --logfile=c:\temp\system_info.log --internal  

3) If sqlmeta.xml file does not exist in the backup label (above), try this
--Check if there is any sqlmeta.xml file in the cluster/shared var directory, if the file exists then delete or move the file to another location. 
--After deleting/moving the file perform full backups and then incremental backups.
--Running full backup followed by incremental backup ensures creation of new sqlmeta.xml file.

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