too many errors 93% scanned, what is it?

Question

Galera always went through this kind of alert, with all okay code, working, and sometimes this alert appears, wanted to know what it means? Should I worry?

Answer 1

where is the code???

Answer 2

*AsterisK* setNarrationText: function() {
this.game_narration.textContent = (this.symbols.turn_index === 1) ? this.players.o + ' turn!' : this.players.x + ' turn!';
},