I have tried editing both headers but didn’t clear the cache.

I under stand the slider was created using the slider revolution, however even my new images i placed are blurry when viewed on site. Please take a look.

Could you please take a look to see what that error might be? also, could you please check to see if the theme is running right? any way i can check to see all the plug ins i need for this theme? I want to make sure I have them all.