Can't seem to get it to work with items from other mods

[Ske3lly]

I've been configuring this mod for a decent amount of time and no matter what I try, I can't seem to get the trades to work on the villager. It just shows up like there is no items in the trade boxes.

        "trade_1_comment":"If there is '_comment' in name it won't be read and You can add some informations here - maybe details about trade for easier remembering what is what. Also '_comment' is used by default, You can change it in configuration file.",
        "trade_1_comment_1":"structure looks like this -> number x item:id + number x item:id = number x item:id",
        "trade_1_comment_2":"1xGranite + 1xPodzol = 7xFern",
        "trade_1":"50xordinarycoins:coinbronze = 1xordinarycoins:coinsilver",
        "trade_2":"50xordinarycoins:coinsilver = 1xordinarycoins:coingold"
    }

[Sejoslaw]

Could You try with 25x... + 25x... = 1x... ?