Can't run your code or submit

Hi. I am testing one of the levels I created but it doesn’t let me run my code or submit.
That level is

You need to post more details as usual. Nobody here can read minds. screenshots help. or any specific details.

In the top right corner is a small triangle facing to the right. This is, as usual, the play-button. It will open a new window (remember to allow pop-ups) in which you can play your level (which you lose after a few seconds because one of the archers dies).

Try changing “humans” to “Hero Placeholder” in the save-thangs goal in the settings:

Then only your hero has to survive, and it doesn’t matter if other humans die.