Reference to non-existent field

Hi,

I have a code that puts the results in a cell for 20 years. I ran it for 5 years. I can work with the results. When I got runing for 20 years data, It shows me this error when I want to use the results.

"Reference to non-existent field 'PRISM'."

What is the problem?there is exactly this field and I can see it but I recieve this error.

[Peng Li]

You’d better give an example dataset. What’s in your cell?