schedule process load workers into candidate Table status retrying

Summary:

While configuring Oracle Recruiting Cloud, unable to run schedule process " Load workers into candidate Table" while running status showing "retrying", what maybe the cause. Other 3-process Load and Index Candidates, Load and Index Job requisitions, Load and Index Master Geography run successfully.

Following options are already exercised.

1. Manage administrative Profile values, profile value, IRC_ELASTIC_SEARCH_ENABLED is set to N.
2. Under profile option, Auto-create profile option is checked.

Can anybody suggest how to resolve & run above process.