(200001) [CRD] Default Whse field is null.oBusinessPartners

I am uploading the Business Partner Master Data thru Data Transfer Workbench, then this error occured:

"(200001) [CRD] Default Whse field is null. (200001) [CRD] Default Whse field is null.oBusinessPartners"

Upon checking, I already set up the default warehouse for the business partner group. Why does this error still occur?