I keep getting this error message when checking my challenge on the "Create Reports with the Report Builder"

Hi,  

I keep getting this error message when checking my challenge on the "Create Reports with the Report Builder" unit even though I have double checked my work several times and even created a new playground. 

Challenge not yet complete in Wise Impala Playground

We couldn’t find the State/Province field in the 'Columns' section.

Could I get some guidance on what else I can try?