PHP Warnings & Critical Error

The following PHP warning is flooding my error logs:

[23-Mar-2023 20:46:48 UTC] PHP Warning: Array to string conversion in /wp-content/plugins/gravityforms/includes/addon/class-gf-addon.php on line 667

I also ended up with this critical error:

[22-Mar-2023 02:24:28 UTC] PHP Fatal error: Uncaught Error: Cannot use object of type WP_Error as array in /wp-content/plugins/connector-gravityforms-mailerlite/class-gf-cgfm.php:875
Stack trace:

/wp-content/plugins/connector-gravityforms-mailerlite/class-gf-cgfm.php(772): GF_CGFM->mailerlite_api('GET', 'groups')

/wp-content/plugins/connector-gravityforms-mailerlite/class-gf-cgfm.php(536): GF_CGFM->initialize_api()

/wp-content/plugins/gravityforms/includes/addon/class-gf-feed-addon.php(362): GF_CGFM->process_feed(Array, Array, Array)

/wp-includes/class-wp-hook.php(310): GFFeedAddOn->maybe_process_feed(Array, Array)

/wp-includes/plugin.php(205): WP_Hook->apply_filters(Array, Array)

/wp-content/plugins/gravityforms/gravityforms.php(7009): apply_filters('gform_entry_pos…', Array, Array, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)

/wp-content/plugins/gravityforms/form_display.php(1807): gf_apply_filters('gform_entry_pos…', Array, Array)

/wp-content/plugins/gravityforms/form_display.php(196): GFFormDisplay::handle_submission(Array, Array, false)

/wp-content/plugins/gravityforms/gravityforms.php(865): GFFormDisplay::process_form(7, 1)

/wp-includes/class-wp-hook.php(308): GFForms::maybe_process_form(Object(WP))

/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array)

/wp-includes/plugin.php(565): WP_Hook->do_action(Array)

/wp-includes/class-wp.php(797): do_action_ref_array('wp', Array)

/wp-includes/functions.php(1332): WP->main('')

/wp-blog-header.php(16): wp()

/index.php(17): require('/home/dfwcrafts…')

16 {main}

/wp-content/plugins/connector-gravityforms-mailerlite/class-gf-cgfm.php on line 875

Gravity Forms believes the two may be related and suggested I contact you. Can you help me figure out the issue?