My site is down due to error in Flash

Can you help?

Tried deleting and installing again via FTP

Translated the error mail with Google:

WordPress version 5.4.2
Current theme: Flash (version 1.3.3)
Current plugin: (version)
PHP version 7.4.7

Details of errors
================
An error of type E_ERROR occurred in line 137 in the file /home/rmeshjpv/printbyorder.dk/wp-content/themes/flash/inc/kirki/modules/webfonts/class-kirki-fonts.php. Error message: [snuffleupagus] [disabled_function] Aborted execution on call of the function ‘include’