S3 copy时候总提示找不到该文件。急急急！！

An error occurred when executing the SQL command:
copy TR_BUYER_SELLER from 's3://awssampledbuswest2/xxl2/test2.csv'CREDENTIALS'aws_access_key_id=AKIAIXJXDM3WQLCESTUQ;aws_secret_access_key=YyUI+III03p...ERROR: The specified S3 prefix 'xxl2/test2.csv' does not exist
  Detail: 
  -----------------------------------------------
  error:  The specified S3 prefix 'xxl2/test2.csv' does not exist
  code:      8001
  context:   
  query:     17775
  location:  s3_utility.cpp:545
  process:   padbmaster [pid=22651]
  ----------------------------------------------- [SQL State=XX000] Execution time: 0.37s1 statement(s) failed.