no market data available (source=empty)

[iva-nova-e-katerina]

└─$ python3 trading_script.py --file "Start Your Own/chatgpt_portfolio_update.csv"
Portfolio CSV is empty. Returning set amount of cash for creating portfolio.
What would you like your starting cash amount to be? 200
Start Your Own/chatgpt_portfolio_update.csv
Empty DataFrame
Columns: [ticker, shares, stop_loss, buy_price, cost_basis]
Index: []
 You have 200.0 in cash.
Would you like to log a manual trade? Enter 'b' for buy, 's' for sell, or press Enter to continue: b
Enter ticker symbol: KALA
Order type? 'm' = market-on-open, 'l' = limit: m
Enter number of shares: 1
Enter stop loss (or 0 to skip): 12.22
MOO buy for KALA failed: no market data available (source=empty).
Empty DataFrame

Why the data source is empty?