Halm ruby on rails : error Encountered a syntax error while rendering template:

I try to execute the following code but I have the error "Encountered a syntax error while rendering template:" and i can't fix it could someone help my ?

Here is my view :

%section
    %article
        - if @toss % 2 === 0
            %p the player #{@player_one.name} start the fight !
        - else 
            %p the player #{@player_two.name} start the fight !

        - while @hp_player_one > 0 && @hp_player_two > 0 
            - @hp_player_one -=  @player_two.attack
                %p  There is only #{@hp_player_one.to_s} point to #{@player_one.name}
            - @hp_player_two -=  @player_one.attack
                %p  There is only #{@hp_player_two.to_s} point to #{@player_two.name}
                -if @hp_player_one <= 0 && @hp_player_two > 0
                    %p #{@player_one.name} lost 
                -elsif @hp_player_two <= 0 && @hp_player_one > 0
                    %p #{@player_two.name} lost 
                -else 
                    %p draw !