Trying to use MFI (RSI, MACD... work fine sor far)

self.MFI(symbol, 14, self.resolution)

I receive a "type mismatch found between consolidator and indicator for symbol: DE30EUR. Consolidator outputs type QuoteBar but indicator expects input type TradeBar."

Adding a lambda function as selector doesn't solve it.

self.MFI(symbol, 14, self.resolution, lambda x: x.BidClose)

I am obviously misunderstanding what is actually needed as a 'selector'. Thank you in advance.

Kind regards