Title: White screen problem
Last modified: September 25, 2018

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# White screen problem

 *  Resolved [shellundersky](https://wordpress.org/support/users/shellundersky/)
 * (@shellundersky)
 * [7 years, 8 months ago](https://wordpress.org/support/topic/white-screen-problem-2/)
 * When I open admin page for WPmail there is only white page.
 * The logs:
 * PHP Fatal error: Call to undefined function WPMailSMTP\Admin\wp_json_encode()
   in /path-to-site/wp-content/plugins/wp-mail-smtp/src/Admin/Area.php on line 138
 * Wordpress 3.8.27
    PHP 5.6 php5-json (installed and enabled)
 * What’s the problem?
    -  This topic was modified 7 years, 8 months ago by [shellundersky](https://wordpress.org/support/users/shellundersky/).

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Author [Slava Abakumov](https://wordpress.org/support/users/slaffik/)
 * (@slaffik)
 * [7 years, 8 months ago](https://wordpress.org/support/topic/white-screen-problem-2/#post-10728399)
 * `wp_json_encode()` function was added in WordPress 4.1. It doesn’t exist in older
   versions of WordPress.
    To quickly fix – rename `wp_json_encode()` to `json_encode()`–
   that will fix this issue.
 * A future version of WP Mail SMTP will have this fixed.
 *  Thread Starter [shellundersky](https://wordpress.org/support/users/shellundersky/)
 * (@shellundersky)
 * [7 years, 8 months ago](https://wordpress.org/support/topic/white-screen-problem-2/#post-10728541)
 * Thanx! That worked!

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘White screen problem’ is closed to new replies.

 * ![](https://ps.w.org/wp-mail-smtp/assets/icon-256x256.png?rev=1755440)
 * [WP Mail SMTP by WPForms - The Most Popular SMTP and Email Log Plugin](https://wordpress.org/plugins/wp-mail-smtp/)
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 * 2 replies
 * 2 participants
 * Last reply from: [shellundersky](https://wordpress.org/support/users/shellundersky/)
 * Last activity: [7 years, 8 months ago](https://wordpress.org/support/topic/white-screen-problem-2/#post-10728541)
 * Status: resolved