2500531 - Error "ERROR BACKUP SAVE DATA terminated with error: [447] backup could not be completed, [2000004] Can not open file" when doing a backup

When a user doing backup, there is an error "SAVE DATA finished with error: [447] backup could not be completed, [2000004] Cannot open file ""<root>/.COMPLETE_DATA_BACKUP_databackup_0_1" ((closed, mode= W, access= rw-r-----, flags= DIRECT|TRUNCATE|MULTI_WRITERS|UNALIGNED_SIZE), factory= (root= "/bck_pru/" (access= rw-r-----, flags= AUTOCREATE_PATH|DISKFULL_ERROR, usage= DATA_BACKUP, fs= UNKNOWN (cifs), config= (async_write_submit_active=auto,async_write_submit_blocks=new,async_read_submit=off,num_submit_queues=1,num_completion_queues=1,size_kernel_io_queue=512,max_parallel_io_requests=64,min_submit_batch_size=16,max_submit_batch_size=64))", rc=22: Invalid argument" generated. 

HANA 1.0 all revisions

KBA , HAN-DB-BAC , SAP HANA Backup & Recovery , Problem