Headers already sent error

  • PHP message: PHP Warning: Cannot modify header information – headers already sent by (output started at /…../wp-content/plugins/woocommerce-click-pledge-gateway/gateway-clickandpledge.php:957) in /…./wp-includes/rest-api/class-wp-rest-server.php on line 1631

    Got error ‘PHP message: PHP Notice: Undefined index: AccountGuid in /…../wp-content/plugins/woocommerce-click-pledge-gateway/gateway-clickandpledge.php on line 705

    PHP message: PHP Warning: preg_match(): Unknown modifier ‘p’ in /…../wp-includes/rest-api.php on line 708

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