"Error reading backup properties" when creating backup for the first time

[janopae]

Describe the bug

When I use iBackep for the first time, it failed with the error pasted below. It is the same error message that happens when using pymobiledevice for the first time without the --full option.

The output also contains New backup folder?: False, which suggests that the detection of an empty backup destination doesn't work.

After using pymobiledevice with the --full option on the command line to create the first backup, creating incremental backups using iBackep works without problems.

To Reproduce
Steps to reproduce the behavior:

1. Select an empty target directory
2. Click on 'Create backup'

It says it failed to create a backup.

This is the output:

iPhone 6s
New backup folder?: False
Backup running...
0.0
0.0
Traceback (most recent call last):
  File "ui/operations.py", line 58, in backup
  File "pymobiledevice3/services/mobilebackup2.py", line 91, in backup
  File "pymobiledevice3/services/device_link.py", line 61, in dl_loop
pymobiledevice3.exceptions.PyMobileDevice3Exception: Device link error: {'ErrorCode': 205, 'ErrorDescription': 'Error reading backup properties (MBErrorDomain/205). Underlying error: Error deserializing properties: Cannot parse a NULL or zero-length data (MBErrorDomain/11).', 'MessageName': 'Response'}

iPhone 6s
New backup folder?: False
Backup running...
0.0
0.0
Traceback (most recent call last):
  File "ui/operations.py", line 58, in backup
  File "pymobiledevice3/services/mobilebackup2.py", line 91, in backup
  File "pymobiledevice3/services/device_link.py", line 61, in dl_loop
pymobiledevice3.exceptions.PyMobileDevice3Exception: Device link error: {'ErrorCode': 205, 'ErrorDescription': 'Error reading backup properties (MBErrorDomain/205). Underlying error: Error deserializing properties: Cannot parse a NULL or zero-length data (MBErrorDomain/11).', 'MessageName': 'Response'}

The error message looks similar to when you use pymobiledevice3 for the first time without the --full option.

Expected behavior
Backup being created

System (please complete the following information):

• OS: Ubuntu 24.04.1 LTS
• Version: 2.0.2

[redromnon]

Please check the latest release if this issue is solved - https://github.com/redromnon/iBackep/releases/tag/v2.0.3