[error] Cannot read property 'toLowerCase' of undefined

Get “Cannot read property ‘toLowerCase’ of undefined” error message. How can i fix this?

Hi, when exactly do you get this? Is there a macro I can run to see this issue?

I got it last night. I am very new to this and was trying to import a json and received that error message. I have attached a link to the file I was trying to get working:

Hi, I see no link in your post?