**BUG**
When trying to export a schematic using A3 size canvas comes back with 'unknown error'. All my other schematics which are on A4 size export fine.
Steps to reproduce bug:
1. look at my ZL-10X block diagram if you can
2. export as pdf
3.
Results: 'unknown error'
Expected results:
Browser: Chrome v 58.0.3029 64 bit on Mac OS Sierra 10.12.4