error for kivy test

nyp@nyp-desktop:~/Desktop$ python3 kivytest.py
[INFO   ] [Logger      ] Record log in /home/nyp/.kivy/logs/kivy_21-01-13_10.txt
[INFO   ] [Kivy        ] v2.0.0
[INFO   ] [Kivy        ] Installed at "/home/nyp/.local/lib/python3.6/site-packages/kivy/__init__.py"
[INFO   ] [Python      ] v3.6.9 (default, Oct  8 2020, 12:12:24)
[GCC 8.4.0]
[INFO   ] [Python      ] Interpreter at "/usr/bin/python3"
[INFO   ] [Factory     ] 186 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_pil (img_pygame, img_ffpyplayer ignored)
[INFO   ] [Text        ] Provider: pil(['text_pygame'] ignored)
[CRITICAL] [Window      ] Unable to find any valuable Window 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
pygame - ModuleNotFoundError: No module named 'pygame'
  File "/home/nyp/.local/lib/python3.6/site-packages/kivy/core/__init__.py", line 62, in core_select_lib
    fromlist=[modulename], level=0)
  File "/home/nyp/.local/lib/python3.6/site-packages/kivy/core/window/window_pygame.py", line 13, in <module>
    import pygame

x11 - ModuleNotFoundError: No module named 'kivy.core.window.window_x11'
  File "/home/nyp/.local/lib/python3.6/site-packages/kivy/core/__init__.py", line 62, in core_select_lib
    fromlist=[modulename], level=0)

[CRITICAL] [App         ] Unable to get a Window, abort.
nyp@nyp-desktop:~/Desktop$