Pull fails without reason

[FHantke]

Hey, I tired to pull a directory from /sdcrad/ but it fails due to reason I don't see. Do you have any idea?
Shell works fine.
Thank you!

Code:

from adb import adb_commands, sign_m2crypto
import os

signer = sign_m2crypto.M2CryptoSigner(os.path.expanduser('~/.android/adbkey'))
device = adb_commands.AdbCommands()
device.ConnectDevice(rsa_keys=[signer])
device.Pull("/sdcard/mipush")

Failure:

Traceback (most recent call last):
  File "test.py", line 7, in <module>
    device.Pull("/sdcard/mipush")
  File "/.../adb/adb_commands.py", line 297, in Pull
    self.filesync_handler.Pull(conn, device_filename, dest_file, progress_callback)
  File "/.../adb/filesync_protocol.py", line 89, in Pull
    for cmd_id, _, data in cnxn.ReadUntil((b'DATA',), b'DONE'):
  File "/.../adb/filesync_protocol.py", line 236, in ReadUntil
    cmd_id, header, data = self.Read(expected_ids + finish_ids)
  File "/.../adb/filesync_protocol.py", line 221, in Read
    raise usb_exceptions.AdbCommandFailureException('Command failed: {}'.format(reason))
adb.usb_exceptions.AdbCommandFailureException: Command failed: 

[fahhem]

Failures usually look like FAILNo such file or directory. If your device doesn't return a reason, then it could be anything. Could you try recursively listing everything in that directory to see if you have access to all the files? Until then, on master I've made this raise an exception that includes the filename that caused the problem