Киви дает мне «КРИТИЧНОЕ» сообщение ⇐ Python

[Anonymous]

Я новичок в Kivy. Киви выдает мне это «КРИТИЧЕСКОЕ» сообщение, но все работает нормально. Там также говорится следующее: [INFO ] [Clipboard ] Provider: gtk3(['clipboard_xclip', 'clipboard_xsel', 'clipboard_dbusklipper'] игнорируется).
Я удалил все сообщения INFO, которые говорит Киви. Пожалуйста, сообщите мне, если мне нужно вернуть их в этот вопрос.
Вот сообщение:

Код: Выделить всё

[CRITICAL] [Cutbuffer   ] Unable to find any valuable Cutbuffer provider. Please enable debug logging (e.g. add -d if running from the command line, or change the log level in the config) and re-run your app to identify potential causes
xclip - FileNotFoundError: [Errno 2] No such file or directory: 'xclip'
File "/home/maheswar/.local/lib/python3.8/site-packages/kivy/core/__init__.py", line 59, in core_select_lib
mod = importlib.__import__(name='{2}.{0}.{1}'.format(
File "", line 1093, in __import__
File "", line 1014, in _gcd_import
File "", line 991, in _find_and_load
File "", line 975, in _find_and_load_unlocked
File "", line 671, in _load_unlocked
File "", line 848, in exec_module
File "", line 219, in _call_with_frames_removed
File "/home/maheswar/.local/lib/python3.8/site-packages/kivy/core/clipboard/clipboard_xclip.py", line 17, in 
p = subprocess.Popen(['xclip', '-version'], stdout=subprocess.PIPE,
File "/usr/lib/python3.8/subprocess.py", line 858, in __init__
self._execute_child(args, executable, preexec_fn, close_fds,
File "/usr/lib/python3.8/subprocess.py", line 1704, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)

xsel - FileNotFoundError: [Errno 2] No such file or directory: 'xsel'
File "/home/maheswar/.local/lib/python3.8/site-packages/kivy/core/__init__.py", line 59, in core_select_lib
mod = importlib.__import__(name='{2}.{0}.{1}'.format(
File "", line 1093, in __import__
File "", line 1014, in _gcd_import
File "", line 991, in _find_and_load
File "", line 975, in _find_and_load_unlocked
File "", line 671, in _load_unlocked
File "", line 848, in exec_module
File "", line 219, in _call_with_frames_removed
File "/home/maheswar/.local/lib/python3.8/site-packages/kivy/core/clipboard/clipboard_xsel.py", line 16, in 
p = subprocess.Popen(['xsel'], stdout=subprocess.PIPE)
File "/usr/lib/python3.8/subprocess.py", line 858, in __init__
self._execute_child(args, executable, preexec_fn, close_fds,
File "/usr/lib/python3.8/subprocess.py", line 1704, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)

Также я использую Linux. Ubuntu 20.04.4.
Заранее спасибо.

Подробнее здесь: https://stackoverflow.com/questions/714 ... al-message