When I activate anything on my website it creates a notice

When I activate any plugin or theme it creates a notice that shows up on the website. Ever since I did the wordpress update it basiclly damaged all my website. Example I activated the blogs-mu theme and it created this notice on the website:

Notice: Use of undefined constant SERVICE_SLUG - assumed 'SERVICE_SLUG' in /hermes/bosoraweb004/b2815/ipg.crecimientoenredesco/blog/wp-content/themes/blogs-mu/_inc/functions/services-functions.php on line 2

Notice: Undefined variable: themename in /hermes/bosoraweb004/b2815/ipg.crecimientoenredesco/blog/wp-content/themes/blogs-mu/_inc/functions/services-functions.php on line 7