This article covers methods to resolve cPanel reported error number 1 when it ended. This error makes cPanel copy action on an account from another server to fail.
The error means that the destination server isn't able to login into the source server to fetch files .
To fix this error, do the following:
1) Recheck your username and password used along with the IP too.
2) Firewall, the source firewall is blocking your destination server IP.
You would need to login into the WHM of the source server and goto "ConfigServer Security & Firewall".
Retry you transfer and it should be working.