Thank you for taking the time to report this.
This might be an issue with self-closing tags. For example, an HTML5 validator will consider the use of <br> valid, but the designer will not. Try to replace tags such as <br> with the alternative <br />.
If this is indeed your issue, after making the necessary changes, you should be able to load index.html in the simulator. We are working on a fix for this issue which will become available in our next release.
Let us know if this helped.
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