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RC2_NO_TRADE

Multiple Symbols declared; mark exactly one as trade=True to designate the trading symbol.

What it means

When a strategy declares two or more Symbol() slots, the transpiler can’t infer which one orders should target. You must mark exactly one with trade=True.

The other slots become data feeds — read-only OHLCV streams. You can read self.spy.close, but self.spy.is_flat and self.buy(self.spy) are errors.

How to fix it

Mark the slot you trade against:

class SPYFiltered(Strategy):
    trade = Symbol(session=USEquityDaily, trade=True)   # ✅ explicit trading slot
    spy = Symbol(ticker="SPY")                            # data feed
    sizing = FixedCapital()


    def execute(self):
        spy_sma = SMA(50, on=self.spy)
        if self.spy.close > spy_sma.value and self.trade.is_flat:
            self.buy(self.trade)

Single-symbol shortcut

In single-symbol strategies the marker is optional — the lone Symbol is implicitly the trading symbol:

class Simple(Strategy):
    trade = Symbol()       # ✅ no trade=True needed
    sizing = FixedCapital()


    def execute(self):
        if self.trade.is_flat:
            self.buy(self.trade)