How to fix Can't add widget Recent Post : javascript:void(0)


Hello please help me, i want to build Blog special Film Animasi but i have some problem :

  1. I can’t add widget recent post . (when i click save button show notification javascripit:void(0)
  2. the replay button in comment does not work
  3. The above header appears strange code

Blog URL : nonohaswit.blogspot (