ISSUE in Backup and Restore Module

Hi all, We are using freepbx distro having following information

PBX Firmware: 1.0.0.0
PBX Service Pack: 1.88.210.57-1

We are having issues in backup and restore module. Backup process completes successfully but restore process fails with this error.

Invalid backup for or undefined error

Freepbx framework is 2.10.0.8 and backup & restore module is 2.10.0.27

Please help us

Check that your restore filename does not have spaces or invalid characters.

my filename does not have spaces or invalid characters.

both machines are Freepbx 2.11.0.11
both machines have Backup 2.11.0.4

I get “Invalid backup for or undefined error” when selecting the copied file (permissions changed to 0777 with WinSCP).

Any ideas?