Notice: register_sidebar was called incorrectly. No id was set in the arguments array for the "Main Sidebar" sidebar. Defaulting to "sidebar-1". Manually set the id to "sidebar-1" to silence this notice and keep existing sidebar content. Please see Debugging in WordPress for more information. (This message was added in version 4.2.0.) in /customers/c/2/1/gitarrlektionerboras.se/httpd.www/wp-includes/functions.php on line 4236 Warning: Cannot modify header information - headers already sent by (output started at /customers/c/2/1/gitarrlektionerboras.se/httpd.www/wp-includes/functions.php:4236) in /customers/c/2/1/gitarrlektionerboras.se/httpd.www/wp-includes/pluggable.php on line 1223