Fatal error: Uncaught Error: [] operator not supported for strings in

I'm getting below error after moving server.
May I missing some configuration?
Thank you for you help!!

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Fatal error: Uncaught Error: [] operator not supported for strings in /???/?????/??????????/apps/???-wpservice/public/wp-content/plugins/domain-mapping/classes/Domainmap/Module/Cdsso.php:350 Stack trace: #0 /???/????/??????????/apps/???-wpservice/public/wp-includes/class-wp-hook.php(298): Domainmap_Module_Cdsso->add_query_var_for_endpoint('') #1 /???/??????/?????????/apps/???-wpservice/public/wp-includes/class-wp-hook.php(323): WP_Hook->apply_filters(NULL, Array) #2 /???/??????/?????????/apps/???-wpservice/public/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #3 /???/??????/?????????/apps/???-wpservice/public/wp-settings.php(449): do_action('init') #4 /???/?????/?????????/apps/???-wpservice/public/wp-config.php(56): require_once('/???/???/???...') #5 /???/??????/?????????/apps/???-wpservice/public/wp-load.php(37): require_once('/???/??????/???...') #6 /???/??????/????????/apps/???-wpservice/public/wp-admin/admin.php(31): require_once('/s in /???/??????/????????/apps/???-wpservice/public/wp-content/plugins/domain-mapping/classes/Domainmap/Module/Cdsso.php on line 350
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NOTE: To avoid the error message, the folder "domain-mapping" has another name.

Thank you for your help.