Getting error while allocating checklist to multiple employees using HDL

Content

We are trying to allocate checklist to multiple employees using HDL. But only the first record is getting allocated successfully. Other records are getting errored-out. We are getting below error.
“An error occurred. To review details of the error run the HCM Data Loader Error Analysis Report diagnostic test. Message details: {MESSAGE}.”

We used below HDL

METADATA|AllocateChecklist|TemplateChecklistName|TemplateChecklistCategory|ChecklistName|Country|ChecklistCategory|ChecklistInstance|PersonNumber|AllowAutoAllocation
MERGE|AllocateChecklist|Return to the Workplace|Enterprise onboarding|Return to the Workplace|#NULL|Enterprise onboarding|1|TESTIN01|Y
MERGE|AllocateChecklist|Return to the Workplace|Enterprise onboarding|Return to the Workplace|#NULL|Enterprise onboarding|1|TESTIN02|Y