stop loss = 0 with long orders is throwing a ValueError

[shparekh]

Hello,
I can't seem to figure out why I get a ValueError when stop loss = 0. I do not intend to use limit orders.

I have following next() in my strategy -

    def next(self):
        super().init()
        price = self.data.Close
        # Long Exit
        if (self.position) and crossover(self.lema, self.lrs):
            # Close any existing long trades, and sell the asset
            self.position.close()
        # Long Entry
        elif (not self.position) and crossover(self.lrs, self.lema) and (price >= self.ema):
            self.buy(sl=(1-self.stop_loss/100)*price)

I am running it with -

    bt = Backtest(df, myStrategy, cash=10000, commission=0, trade_on_close=True, exclusive_orders=False, hedging=False)

with stop_loss = 0, it throws following error -

File ~\AppData\Roaming\Python\Python311\site-packages\backtesting\backtesting.py:713, in _Broker.new_order(self, size, limit, stop, sl, tp, trade)
    711 if is_long:
    712     if not (sl or -np.inf) < (limit or stop or adjusted_price) < (tp or np.inf):
--> 713         raise ValueError(
    714             "Long orders require: "
    715             f"SL ({sl}) < LIMIT ({limit or stop or adjusted_price}) < TP ({tp})")
    716 else:
    717     if not (tp or -np.inf) < (limit or stop or adjusted_price) < (sl or np.inf):

ValueError: Long orders require: SL (0.4557679295539856) < LIMIT (0.4557679295539856) < TP (None)

What am I doing wrong?

Thank you.
Best regards