Not allowed to place card

[pecyg]

Hi all,

Why was my opponent allowed to place the watchout tile to the very right column but I wasn't? My try was in step 9 / 10 and he placed it in the right column before already.

https://boardgamearena.com/table?table=689877379

Regards
pecyg

[thoun]

I guess it is the island, on the column (-1 gold), and he had no gold? You can't go negative on gold, that's the rule.