404 issues with unminified JavaScript and CSS files

[ihs1]

HI

i have done a site audit and i keep getting the error: 

404 issues with unminified JavaScript and CSS files

i assume this is also what is affecting the visual stability, speed issues and also too much html to text ratio issues, as well as having a low pagespeed insight score. 

can someone please help so i can rectify this and advise what this means

[DelightCart]

@ihs1 Can you please send me the store address to check that 404 issue.

[ihs1]

Www.infraredheatingsupplies.com

[ihs1]

HI

hope all is well

did you get a chance to have a look at the above issue. any help will  be appreciated