pango error
(process:553): Pango-CRITICAL **: 14:47:46.700: pango_font_get_hb_font: assertion 'PANGO_IS_FONT (font)' failed
[2020-07-06 14:47:46 +0000] [820] [INFO] Booting worker with pid: 820
/usr/local/lib/python3.7/site-packages/weasyprint/fonts.py:230: UserWarning: FontConfig: No fonts configured. Expect ugly output.
'FontConfig: No fonts configured. '