Can not upload table in PHP 8.0 – error message

Have used TablePress for my small, private community page for many years. Recently, my ISP demanded that PHP be upgraded to 8.0. Around the same time, I started getting this message every time I uploaded a new table:

Warning: set_time_limit(): Cannot set max execution time limit due to system policy in /customers/1/f/e/ligakonkurransen.no/httpd.www/wp/wp-content/plugins/tablepress/classes/class-import.php on line 80 Warning: Cannot modify header information – headers already sent by (output started at /customers/1/f/e/ligakonkurransen.no/httpd.www/wp/wp-content/plugins/tablepress/classes/class-import.php:80) in /customers/1/f/e/ligakonkurransen.no/httpd.www/wp/wp-includes/pluggable.php on line 1416 Warning: Cannot modify header information – headers already sent by (output started at /customers/1/f/e/ligakonkurransen.no/httpd.www/wp/wp-content/plugins/tablepress/classes/class-import.php:80) in /customers/1/f/e/ligakonkurransen.no/httpd.www/wp/wp-includes/pluggable.php on line 1419

Before I start fiddling around with the php-files in order to try to make TablePress work again, is there an obvious answer to these problems?

 

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