BackupWp Nginx Problem

Hi.
I migrate all my sites in nginx server.
I delete all plugin and reinstall them.
But I cannot run a job at all.
I get a message “Not expected HTTP response body: 404 Not Found 404 Not Found nginx/1.6.2”

I have enabled permalinks in ngingx configuration and everything seems to work fine except the backupwp plugin.
Any ideas?
All best.

https://ww.wp.xz.cn/plugins/backwpup/