I need help with /testfor command
The syntax for testing for players with at least some scoreboard objective value is such:
/testfor @a[score_objective_min=0]
,where objective is the name of your objective, and 0 is the minimal value (in whole numbers) that one of the the players must have.
I assume you objective is named player (with a small 'p'). The command would then be:
/testfor @a[score_player_min=0]