Errors in the Fish Game Tutorial

In the fish game tutorial - part 2 - "moving a fish" I believe there are a few errors. I copied the code exactly as the tutorial shows it, but when I run the game and try to move the fish, it says there are two script errors and nothing happens. I made sure I saved the script and re-opened TGB. I believe one error involves quotation marks: exec("./player.cs"); While in another place in the tutorial it looks like this: exec('./player.cs'); I haven't been able to find the other one. Really, all I want to know is how to bind a key to make the fish move. I would appreciate any feedback.