order.error.default when selling open position

[JoshuaSparx]

Hi,

Everything always used to work fine, but for some reason all of a sudden whenever i try to sell a asset (ADYEN) in this case., i always get the error: order.error.default as a return when creating the order.
I currently have 1 position open on adyen (size=1), and try to do SELL 1.

    const order = {
      buySell: DeGiroActions.SELL,
      orderType: DeGiroMarketOrderTypes.MARKET, // LIMITED, MARKET, STOP_LOSS_LIMIT, STOP_LOSS
      productId: symbolId,
      size: 1,
      timeType: DeGiroTimeTypes.PERMANENT,
    };