Approver list error while changing the working hours of the employee by using person Management?

Summary:

If we see Approver list getting error while while changing the working hours of the employee by using person Management?Content (required):

Error :- 

The approval history can't be displayed because this task couldn't be assigned to any approver.

Details :-

Rleset didnt return any results. Reconfigure the conditions in the rule set TerminationsRuleSet for the task TerminationsApproval so that approvers are found. Model the ruleset so that it returns a list builder specification. 

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