PHP Fatal error: Uncaught TypeError: fclose()

I’m unable to activate the plugin. I receive the following error.

nginx 1.23.0
PHP 8.0.20

[13-Jul-2022 20:11:13 UTC] PHP Fatal error:  Uncaught TypeError: fclose(): Argument #1 ($stream) must be of type resource, bool given in /usr/opt/www/example.com/httpdocs/blog-test/wp-content/plugins/wpforo/wpf-includes/functions.php:843
Stack trace:
#0 /usr/opt/www/example.com/httpdocs/blog-test/wp-content/plugins/wpforo/wpf-includes/functions.php(843): fclose(false)
#1 /usr/opt/www/example.com/httpdocs/blog-test/wp-content/plugins/wpforo/wpf-includes/class-cache.php(55): wpforo_write_file('/usr/opt/www/hz...', '')
#2 /usr/opt/www/example.com/httpdocs/blog-test/wp-content/plugins/wpforo/wpf-includes/class-cache.php(49): wpForoCache->mkdir(Array)
#3 /usr/opt/www/example.com/httpdocs/blog-test/wp-content/plugins/wpforo/wpf-includes/class-cache.php(19): wpForoCache->dir('/usr/opt/www/hz...')
#4 /usr/opt/www/example.com/httpdocs/blog-test/wp-content/plugins/wpforo/wpf-includes/class-cache.php(11): wpForoCache->init()
#5 /usr/opt/www/example.com/httpdocs/blog-test/wp-content/plugins/wpforo/wpforo.php(146): wpForoCache->__construct()
#6 /usr/opt/www/example.com/httpdocs/blog-test/wp-content/plugins/wpforo/wpforo.php(112): wpForo->__construct()
#7 /usr/opt/www/example.com/httpdocs/blog-test/wp-content/plugins/wpforo/wpforo.php(1158): wpForo::instance()
#8 /usr/opt/www/example.com/httpdocs/blog-test/wp-content/plugins/wpforo/wpforo.php(1163): WPF()
#9 /usr/opt/www/example.com/httpdocs/blog-test/wp-admin/includes/plugin.php(2313): include_once('/usr/opt/www/ex...')
#10 /usr/opt/www/example.com/httpdocs/blog-test/wp-admin/includes/plugin.php(661): plugin_sandbox_scrape('wpforo/wpforo.p...')
#11 /usr/opt/www/example.com/httpdocs/blog-test/wp-admin/plugins.php(58): activate_plugin('wpforo/wpforo.p...', 'https://www.exa...', false)
#12 {main}
  thrown in /usr/opt/www/example.com/httpdocs/blog-test/wp-content/plugins/wpforo/wpf-includes/functions.php on line 843