hi, I'm new to this platform and have some problems implementing the simplest things...

why do i get the following errors:

Backtest Handled Error:
TXN R735QTJ8XC9X not found in portfolio. Request this data when initializing the algorithm.

Backtest Handled Error:
The security with symbol 'DH R735QTJ8XC9X' is marked as non-tradable.

many thanks.