I need help with signs

[christianmv84]

on rightclick on sign:
    1st line of clicked block is "a"
    2nd line of clicked block is "b"
    3nd line of clicked block is "c"
    if player has permission "{@permission}":
        if player is holding air:
            open chest with 2 rows named "&3x" to player

Error: the clicked block is not a world Line 4: 3end line of clicked block is "c"

 

[White]

Should be 3rd line, not 3nd.