errors in theme.

hi . hope this is posted in the correct place .
I have had problems with my website http://www.spectrummagic.co.uk and have found some errors.
My main problem is that my main menu is non responsive on mobile device and small window.. im sure you get what i mean.

is this a theme error and does it need to be reinstalled.

ctrl+shift+j give me a number of errors.

thanks for reading ….
forgive me im new….