Can you please tell me what the errors are in this debug?

// This program creates a screen with a textbox and a button. // When the user clicks the button, a label displays the result // which is 10% of the number in the textbox start Declarations Screen screen1 Button calcButton Textbox usersEntry Label result screen1.setSize(200, 200) calcButton.setText("Click to calculate 10% tax") screen1.add(usersEntry) screen1.add(calcButton) stop

calculateTax() Declarations Label result num tax num RATE = 0.10 string answer tax = usersEntry.getText() * RATE answer = "The tax is ", tax screen1.add(result) return