Hello Jamie,
Thanks for submitting a question about theme failure. That is certainly a unique error. If you can provide any further information we could use to replicate it we would be very interested.
I’d also advise checking to see if BoldGrid is conflicting with other plugins. I can’t recall an occasion in which I’ve seen a similar error to the one you’re describing. Is it possible that it’s coming from a different plugin or theme?
Best,
Christopher M.