ORA-20001: System Error: Procedure sort_segment_order at Step 40

dears,

when i trying to use assign employees api for oracle EBS 12.1.3

i got this messages after tracing .

declare

ln_people_group_id   NUMBER                      := hr_api.g_number;

end;

Entering: HR_ASSIGNMENT_BK3.UPDATE_EMP_ASG_CRITERIA_B                   10

  hr_api.validate_commit_unit                                           10

Leaving: HR_ASSIGNMENT_BK3.UPDATE_EMP_ASG_CRITERIA_B                   20

Entering hr_kflex_utility set_profiles                                  5

hr_kflex_utility set_profiles                                           10

hr_kflex_utility set_profiles                                           20

hr_kflex_utility set_profiles                                           30

hr_kflex_utility set_profiles                                           40

hr_kflex_utility set_profiles                                           50

Leaving hr_kflex_utility set_profiles                                   100

Entering hr_kflex_utility set_session_date                              5

hr_kflex_utility set_session_date                                       30