Thanks for filing an issue. Following these instructions will help us solve your problem sooner.

1. Describe the issue.
2. Create a gist for this issue (Sample gist: https://gist.github.com/stevendaniels/98a05849036e99bb8b3c)? 

Here are some instructions for creating such a gist. 

1. Create a gist (https://gist.github.com) with code that creates the error.
2. Clone the gist repo locally, add a stripped down version of the offending spreadsheet to the gist repo, and push the gist's changes master.
3. Paste the gist url here.