Custom visual import issue

I'm creating a custom visual to read color from data. I followed the code guideline on github and tested it in visual playground. The source code is here:

https://github.com/dnprock/PowerBI-visuals/tree/master/src/Clients/CustomVisuals/visuals/colorBarChart

I run 'gulp package' to create release for it. When I import to Power BI web, I get the following error:

"Uncaught SecurityError: Failed to set the 'cookie' property on 'Document': The document is sandboxed and lacks the 'allow-same-origin' flag."

Any idea what I might have missed in my package?

Thanks.