Error message on the website

Hello.

Thank you for the development of the otter block plugin.

Otter block plugin is useful for making beautiful layout for web pages.

I use otter block plugin on the WordPress website.

Name; Gutenberg Blocks and Template Library by Otter
Version 10.7.4

The website shows the following error messages, which I just can't to get rid of.

This occurs several times.

Error details;

Fatal error: Maximum execution time of 30 seconds exceeded in /www/site domain/wp-content/plugins/otter-blocks/inc/class-base-css.php on line 236

The class-base-css.php shows the following words in line 236.

Line 236: 
$list = array_merge( $props, $attr );

If you have useful way to solve this problem, would you please tell me how to correct the error?

Thank you.