Yet again: "Error initializing Java Runtime Environment. You may need to reinstall Flash."

I've seen this a few times on the forum, but almost always for another Adobe program.

The facts are:

• Adobe Animate, build 16, 2017.1 release.
• We have already reinstalled Flash (currently running Flash 26). We have reloaded the program, and tried restarting everything.
• The project is a short test project; HTML5 Canvas. Testing and export were all tested in IE and Chrome (same results).
• If I include any Action script, the error occurs. An example basic Action such as the HTML5 Canvas script:   this.stop();
• The project tests and exports as movie okay if I include nothing in "Actions". Project tests in browser okay with some kinds of Action scripts, but always gives error during Export. If I add the Action script I want to use, the project test shows only the canvas color background, and nothing else (and if I export with that desired script, the error occurs).

Perhaps related: In an ActionScript 3.0 project, any ActionScript project gives me the same error if I include any ActionScript Actions, both during test and export.