[Resolved] choose from previously created fields does not work

[Author]

Posts

[weixiangS]

Tell us what you are trying to do?
I am trying to add an previously created fields in my post type.

after I click the button "choose from previously created fields". nothing happen,

[Minesh]

Hello. Thank you for contacting the Toolset support.

Can you please tell me what fields you have created before and what fields you want to add to which custom field group?

In addition to that:
*** Please make a FULL BACKUP of your database and website.***
I would also eventually need to request temporary access (WP-Admin and FTP) to your site. Preferably to a test site where the problem has been replicated if possible in order to be of better help and check if some configurations might need to be changed.

I have set the next reply to private which means only you and I have access to it.

[Minesh]

I checked on your install and when I click on button "choose from previously created fields", it throws the 500 internal server error on browser's console.

 POST <em><u>hidden link</u></em> 500 (Internal Server Error)

Can you please check with your server authority why it throws the internal server error.

[weixiangS]

[11-May-2020 11:02:29 UTC] PHP Fatal error: Uncaught Error: Call to undefined function mb_strtolower() in /home/imagemc1/public_html/wp-content/plugins/types/vendor/toolset/types/includes/classes/class.types.admin.edit.fields.php:756
Stack trace:
#0 [internal function]: Types_Admin_Edit_Fields->sort_by_field_name(Array, Array)
#1 /home/imagemc1/public_html/wp-content/plugins/types/vendor/toolset/types/includes/classes/class.types.admin.edit.fields.php(1172): uasort(Array, Array)
#2 /home/imagemc1/public_html/wp-includes/class-wp-hook.php(287): Types_Admin_Edit_Fields->field_select('')
#3 /home/imagemc1/public_html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters('', Array)
#4 /home/imagemc1/public_html/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#5 /home/imagemc1/public_html/wp-admin/admin-ajax.php(175): do_action('wp_ajax_wpcf_ed...')
#6 {main}
thrown in /home/imagemc1/public_html/wp-content/plugins/types/vendor/toolset/types/includes/classes/class.types.admin.edit.fields.php on line 756

[Minesh]

Great.

The error:

Fatal error: Call to undefined function mb_strtolower()

The multibyte string extension (mbstring) is required for Toolset, as you can see with the following Toolset server requirement Doc: => https://toolset.com/toolset-requirements/.

You need to enable mbstring on your server. Please contact your hosting authorities and ask them to enable this extension. To solve this issue you need to install this extension on your server:
=> hidden link

If you are using cpanel please check this link:
=> hidden link

[weixiangS]

My issue is resolved now. Thank you!