Errors on my multisite setup, need help

I have a multisite setup here using sub domains but everytime i try to set up a new site i get a crazy error:

Warning: call_user_func_array() []: First argument is expected to be a valid callback, 'new_blog' was given in /home/justcats/public_html/ on line 406
Warning: Cannot modify header information - headers already sent by (output started at /home/justcats/public_html/) in /home/justcats/public_html/ on line 876

When i refresh and go back in i see the site but it goes to a dead page , not even a 404/505 error page.

I followed setting up a network and am using Pro sites and some other multisite plugins from here

My site is:
example of a new site:

you are welcome to sign up and try it if possible

Anyone have any ideas?