click event not working..

Question

pls guys go through my code, i keep getting "cannot get property of null.. although i included the windows.onload function
https://code.sololearn.com/WG96uRXHnPtY/?ref=app

Answer 1

ROSE TOIYO JOHN
https://code.sololearn.com/W0aHFl33Trvv/?ref=app

Answer 2

pls what did you add to the code.. i haven't noticed it yet @rkk

Answer 3

rkk thanks a lot... I didn't notice...

Answer 4

ROSE TOIYO JOHN
1) you access the wrong button id name from js.(check the ID spelling properly)
2) it's setInterval and not Setinterval.
3) check your variable spelling and capital/small letters properly.