attached log file photo, please help me on this

2018-08-08 18:03:17,780 [SERV] [1] NOTICE - Plan 25edd19d-3778-44be-ba94-c9cea2aa735f 'testbkp on 8/8/2018 6:00:57 PM' (Plan). Force full mode :False
2018-08-08 18:03:21,058 [Base] [10] ERROR - Request failed, retrying in 400 msec, 3 attempts left

i have created S3 Bucket on AWS and connected it from cloudberry backup application.
Credited backup plan but backup getting fail, please help me on this...