[MX 2004] Errore che non capisco!

[frabontempo]

**Error** Scene=Scene 1, layer=preloader, frame=1:Line 2: Type mismatch in assignment statement: found Number where Boolean is required.
_visible = 0;

**Error** Scene=Scene 1, layer=preloader, frame=1:Line 17: Type mismatch in assignment statement: found Number where Boolean is required.
_visible = 1;

Total ActionScript Errors: 2 Reported Errors: 2

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Che mi dite, il filmato funziona comunque. Ma il rpogramma mi da questo errore.