VBA Code F8 works but F5 doesn't

[YLCheng]

I would save the data as JPG into the folder and I set up the VBA as the following, it's work when stepping through the code of F8, but running the code of F5 doesn't (show run-time error "91").
Anyone can tell me the solution for it?
The error happen

 

[Georgiboy]

That would tell me that it is not a problem with waiting and more a problem with finding the item Array("chart") at this stage

 

[RoryA]

It would be helpful if you could post the code as part of your post, not as a picture. Nobody wants to have to retype it for testing.