Details of the error are attached to the report, which will be publicly viewable. If you are not comfortable with that, you can edit the report below and remove all the data you don't want to share.
error: Unknown operation
user agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36
screen size: 1500x1000
canvas size: 1469x759
image size: 2276x1260
thumbnail size: CSS: 1372x759, screen width: 2744, real width: 2880