HDL error "Message details: Cannot get property 'CountryVA' on null object.

Summary:

Has anyone encountered this error message?

"An error occurred. To review details of the error run the HCM Data Loader Error Analysis Report diagnostic test. Message details: Cannot get property 'CountryVA' on null object."

Content (please ensure you mask any confidential information):

I was loading an HDL to fix data issues where employees have proposed worker type populated for them in the backend.

Code Snippet (add any code snippets that support your topic, if applicable):

Here is the sample HDL (data masked)
METADATA|WorkTerms|EffectiveStartDate|EffectiveEndDate|EffectiveSequence|EffectiveLatestChange|AssignmentId|AssignmentType|PersonId|PeriodOfServiceId|ActionCode|PersonNumber|ProposedUserPersonType
MERGE|WorkTerms|2019/09/01|4712/12/31|1|Y|300005258201123|ET|300000325057123|300005258201123|ORA_POS_SYNC|A123456|#NULL