ERROR: GPT formated hard disk encountered. UrBackup does not support GPT formated hard disks!

Hi there,
I have recently updated my server (move from Win7 to Ubuntu 14.0), and my clients (from 1.4.8 to 1.4.10)
In my network, there’s about ten notebooks with same characteristics, nine of them do their backup flawless. But, there’s a notebook (Windows Pro 8.1),which has turned into a headache.
This is what debug.log contains

2015-12-22 16:19:03: WARNING: Upgrading…
2015-12-22 16:19:03: ERROR: Error preparing Query [SELECT tvalue FROM misc WHERE tkey=‘db_version’]: no such table: misc
2015-12-22 16:19:10: ERROR: Error preparing Query [DROP INDEX filehashes_idx]: no such index: filehashes_idx
2015-12-22 16:19:10: ERROR: GPT formated hard disk encountered. UrBackup does not support GPT formated hard disks! (Volume=\?\Volume{5c0653d0-9446-4aa6-aec0-679123c10f60})
2015-12-22 16:19:10: ERROR: GPT formated hard disk encountered. UrBackup does not support GPT formated hard disks! (Volume=\?\Volume{7cc6e414-1e66-4678-9662-e687f0f7a601})
2015-12-22 16:19:10: ERROR: GPT formated hard disk encountered. UrBackup does not support GPT formated hard disks! (Volume=\?\Volume{9f2d711d-4e45-4d29-afc6-8ed28dfa2789})

which additional information should i provide in order to get a possible solution for this?

Thanks in advance.
Best regards

xxxxxxxxxx

Server Log.

Level Time Message

Info 22.12.15 16:19 Starting full file backup…
Errors 22.12.15 16:19 Constructing of filelist of “sales-ntbk” failed: ERR
Errors 22.12.15 16:19 Backup had errors. Deleting partial backup.
Warnings 22.12.15 16:19 Exponential backoff: Waiting at least 14 days 5h 20m before next file backup

OK, my bad, after setting up the client in “Debug Mode” i realized that I wasn’t configured the “sources folders” to backup, so the client was indexing the whole machine, including off course the “recovery partition”.
After adding the desired folders in “folders to backup”, the client’s start to run flawless.

Will leave this thread here, in case someone else has a similar issue.

Best Regards