If you are looking at the #CAKE/BNB trading pair, which means:

You use $BNB to buy #CAKE. The price is shown in BNB (Example: 0.002809 BNB = 1 CAKE)

Since you have 0.00 BNB, you cannot buy CAKE right now.

💡 Tip

If you want to trde CAKE/BNB, you must first buy or transfer BNB to your Spot wallet.