Error code: 90

[andoruB]

Tried running Tingle on my Moto G6 Plus to patch the Lineage OS install I have, but when I try to run main.py, I get this:

$ ./main.py
MENU

    1 - Patch file from a device (adb)
    2 - Patch file from the input folder

> 1

 *** OS: Linux 4.19.0-5-amd64 (linux)
 *** Python: 2.7.16 (64 bit)
 *** Mode: 1
 *** Working dir: /tmp/Tingle-lIHv9p
 *** Selected device: ZY322TXVZ4
 *** Automounting /system...
      DEBUG: Already mounted
 *** Pulling framework from device...

ERROR INFO
==========
Type: <class 'subprocess.CalledProcessError'>
Cmd: ['/usr/bin/adb', '-s', u'ZY322TXVZ4', 'pull', '/system/build.prop', '.']
Return code: 1
Output: adb: error: failed to copy '/system/build.prop' to './build.prop': remote open failed: Permission denied


ERROR CODE: 90

I made sure that I have superuser privileges by entering the shell through adb and typing 'su'.

Here's the logcat:
logcat.tar.gz