8. Debugging | Gamemaker Essentials

Errors

We will start with common errors in GameMaker. Things such as undeclared variables or non-existent objects will cause GameMaker to produce an error (stating basic information of what went wrong and where in the code it happened). There is no single cause for this, so we will look at a few common errors that may occur and see how to read them in order to get closer to finding the problem.

Undeclared variable

The following is a screenshot of an error produced by an undeclared variable:

All GameMaker errors look similar to this one. However, depending on the problem, there may be more or less information provided regarding the error.

Here is an image of just the text so that we can better read what is going on:

You will probably notice the lines of hashtags; these are more or less just borders or line breaks. Feel free to ignore them.

The first four lines are important; they show exactly where and in which object the error took place. As you can see, the error states that in action number...

Tech Concepts

Programming languages

Tech Tools

Unlimited access to the largest independent learning library in tech of over 8,000 expert-authored tech books and videos.

Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.

50+ new titles added per month and exclusive early access to books as they are being written.

Gamemaker Essentials

Gamemaker Essentials

Overview of this book

Errors

Undeclared variable

Confirmation

Buy this book with your credits?

Submit Your Feedback

Create a Free Account To Continue Reading

Sign in to activate your 7-day free access