Skellet Legacy fish state

[OctoHash25]

I get this error when reloading this skript:
Can't understand this condition: 'fish state is CAUGHT_FISH' (skilllevelling.sk, line 664: if fish state is CAUGHT_FISH:')

This is my code:

on fishing:
    if fish state is CAUGHT_FISH:
        chance of 70%:
            #play sound "entity.experience_orb.pickup" with volume 0.5 to the player
            skills__play_xp_sound(player)
            add 1 to {fishingxp::%player%}
            set action bar of player to "&f &3Fishing EXP &3%{fishingxp::%player%}%&7/&b%{fishingmax::%player%}% &7&o(+1)"

 

[Minecoll_YT]

try using both in a string and then comparing them