Ajax Load More pro not working, can’t activate it

Hello I just purchased your plugin Ajax Load More Pro but it doesn’t let me activate on my website.

The error I get is this one:

2019/02/02 16:56:12 [error] 1977#1977: *1223009 FastCGI sent in stderr: “PHP message: PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘dbfw_load_custom_admin_style’ not found or invalid function name in /var/www/xxxxxxxx/public_html/wp-includes/class-wp-hook.php on line 286” while reading response header from upstream, client: 188.114.110.115, server: xxxxxxxx, request: “GET /wp-admin/plugins.php?error=true&plugin=ajax-load-more-pro%2Fajax-load-more-pro.php&_error_nonce=3245b6215a HTTP/1.1”, upstream: “fastcgi://unix:/run/php/php7.2-fpm.sock:”, host: “xxxxxxxxx”, referrer: “https://xxxxxxxxxxx/wp-admin/plugins.php?plugin=ajax-load-more-pro%2Fajax-load-more-pro.php”

can you help me?

I run my website on Nginx , latest WordPress, Newspaper theme.

Thanks