Fatal error: Duplicate declaration of static variable $fields in /customers/a/1/4/vvt-techniek.be/httpd.www/wp-content/plugins/ninja-forms/includes/Admin/CPT/Submission.php on line 245
Stack trace:
#0 /customers/a/1/4/vvt-techniek.be/httpd.www/wp-content/plugins/ninja-forms/ninja-forms.php(373): Ninja_Forms->autoloader('Admin_CPT_Submi...')
#1 /customers/a/1/4/vvt-techniek.be/httpd.www/wp-content/plugins/ninja-forms/ninja-forms.php(1178): Ninja_Forms::instance()
#2 /customers/a/1/4/vvt-techniek.be/httpd.www/wp-content/plugins/ninja-forms/ninja-forms.php(1181): Ninja_Forms()
#3 /customers/a/1/4/vvt-techniek.be/httpd.www/wp-settings.php(560): include_once('/customers/a/1/...')
#4 /customers/a/1/4/vvt-techniek.be/httpd.www/wp-config.php(96): require_once('/customers/a/1/...')
#5 /customers/a/1/4/vvt-techniek.be/httpd.www/wp-load.php(50): require_once('/customers/a/1/...')
#6 /customers/a/1/4/vvt-techniek.be/httpd.www/wp-blog-header.php(13): require_once('/customers/a/1/...')
#7 /customers/a/1/4/vvt-techniek.be/httpd.www/index.php(17): require('/customers/a/1/...')
#8 {main}