Failed HTML build + errors

Dear everyone,

Today I wanted to test my project for the first time on a browser.
Sadly, I am not able to do to due some warnings and a build fail.

First of all, I receive the next warning multiple times in the log when I launch the game on a browser.
Warning Unable to find package for cooking /Game/Blueprints/PuzzleGameMode

After a few seconds, the launch fails and gives me this error:
PackagingResults:Error: Error Launch failed! Unknown Error

A browser tab opens but it just shows the default “Cannot connect” page.
Thanks in advance.

Yours sincerely,

William.

Hey WilliamPraat,

Thank you for taking the time to report this issue, and we appreciate your patience while awaiting a response. In order to assist you in an effective manner, we would like to see if you are still experiencing the issue you are reporting in engine versions 4.8.3 and/or 4.9.2?

If so, would you mind providing some simple steps, screenshots, or any other relevant pieces of information to help us reproduce the issue on our end?

Thank you,