Unable to Open File Message

Please see:
https://wordpress.org/support/topic/unable-to-open-file-message/

Here are is my error log:

[Tue May 25 10:51:31 2021] [warn] [pid 34620] sapi_apache2.c(349): [client 69.11                                                                                                 9.154.248:51560] PHP Warning:  fopen(/var/www/html/library/new4/wp-content/plugi                                                                                                 ns/alert-notice-boxes/css/parts/animations_style.css): failed to open stream: Pe                                                                                                 rmission denied in /var/www/html/library/new4/wp-content/plugins/alert-notice-bo                                                                                                 xes/classes/class_animations.php on line 12
[Tue May 25 10:51:52 2021] [warn] [pid 33355] sapi_apache2.c(349): [client 69.11                                                                                                 9.154.248:51566] PHP Warning:  fopen(/var/www/html/library/new4/wp-content/plugi                                                                                                 ns/alert-notice-boxes/css/anb-dynamic.css): failed to open stream: Permission de                                                                                                 nied in /var/www/html/library/new4/wp-content/plugins/alert-notice-boxes/include                                                                                                 s/anb_functions.php on line 104

On my development server, I even tried: installing the older version and then updating as well as deleting and starting fresh.

Any ideas?

Thank you!