Fatal error: Cannot redeclare get_page_by_title() (previously declared in C:\Inetpub\vhosts\stefankuehn-consulting.de\httpdocs\wp-includes\post.php:5778) in C:\Inetpub\vhosts\stefankuehn-consulting.de\httpdocs\wp-includes\deprecated.php on line 4557

Fatal error: Uncaught Error: Call to a member function set() on null in C:\Inetpub\vhosts\stefankuehn-consulting.de\httpdocs\wp-includes\l10n.php:784 Stack trace: #0 C:\Inetpub\vhosts\stefankuehn-consulting.de\httpdocs\wp-includes\l10n.php(872): load_textdomain('default', 'C:\\Inetpub\\vhos...', 'de_DE') #1 C:\Inetpub\vhosts\stefankuehn-consulting.de\httpdocs\wp-includes\class-wp-fatal-error-handler.php(47): load_default_textdomain() #2 [internal function]: WP_Fatal_Error_Handler->handle() #3 {main} thrown in C:\Inetpub\vhosts\stefankuehn-consulting.de\httpdocs\wp-includes\l10n.php on line 784