I can not show the images

I have been testing the plugin but I can not get the images displayed. They appear as broken in the pdf.

I have detected the following errors in my error_log:

Unknown: open_basedir restriction in effect. File(/directorydomain/wp-admin/admin-ajax.php) is not within the allowed path(s): (/directorydomain/tmp/) in Unknown on line 0

PHP Warning: copy(): Filename cannot be empty in /var/www/vhosts/weberos.es/enuk.es/wp-content/plugins/send-pdf-for-contact-form-7/classes/send-pdf.php on line 465

If you can help me solve these errors, thank you