register_sidebar was called incorrectly Defaulting to sidebar-1

turned on wp-config debugging.. output to file.. turned off tons of plugins – reinstalled 2014 theme – still getting this:

PHP Notice: register_sidebar was called incorrectly. No id was set in the arguments array for the “Sidebar 1” 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 sitepath/sitename/wp-includes/functions.php on line 3622

Is this a bug in 2014 theme?
I am running a multi-site, with just a couple plugins running.. so I don’t know – maybe these errors are being dropped into the debug log as views are made on sub blogs with different themes?

I am also getting
PHP Warning: Cannot modify header information – headers already sent by (output started at path/to/sitename/wp-includes/functions.php:3622) in path/to/sitename//wp-login.php on line 431

I even reinstalled wp 4.3 again

Is anyone else seeing this issue with WP MS and 2014?
(when debugging and logging turned on)