PHP File Manager

Error while copying from upfile/simulation/del/1/case01innishikai.csv to upfile/simulation/del/6/case01innishikai.csv

Name	Size	Modified	Perms	Owner
..
case01innishi.csv	11.69 KiB	15.06.22 10:17	0777	azureuser:azureuser
file6.csv	2 B	06.09.22 10:57	0777	azureuser:azureuser
shinhonboku-geiod.csv	5 B	06.09.22 11:15	0777	azureuser:azureuser
sweivel2.csv	1.03 KiB	19.07.22 05:55	0777	azureuser:azureuser
Full size: 12.73 KiB, files: 4, folders: 0