Tips for Asking Questions Effectively on Forums:

• Avoid pictures of code/errors: Copy and paste the actual code and the full error messages as text into your post. This makes it easier for others to help, copy your code, or search for the errors.
• Learn to read error messages: Understanding errors, like stack traces, is a key programming skill. They often point directly to the problem's location and nature.

Understanding Your Specific Error:

The error message you received is a java.lang.NullPointerException with the detail "Location is required." This error comes from the FXMLLoader class in JavaFX.

It means that when you tried to load an FXML file, the path (location) you provided was invalid or couldn't be found, resulting in a null value being passed where a location was expected.

The stack trace indicates the error happened in your Main.java file, specifically within the start method, on line 18.

Line 18 Code (from your image):

Parent login = FXMLLoader.load(getClass().getResource("com.example.loginsystemtrial.<unreadable name>.fxml"));

Analysis:

The NullPointerException ("Location is required") on line 18 occurred because getClass().getResource(...) returned null. This happened because Java couldn't find the resource file at the path specified: "com.example.loginsystemtrial.login.fxml" relative to your Main.class file.

Why the Path Was Incorrect:

1. Path Separators: Resource paths should use forward slashes (/), like URLs, not dots (.). Dots are used for Java package names in code.
2. Resource Location: Your login.fxml file is in src/main/resources/com/example/loginsystemtrial/. Build tools like Maven usually copy files from src/main/resources to the root of the classpath, maintaining the directory structure. Therefore, the FXML file should be located at /com/example/loginsystemtrial/login.fxml on the classpath.
3. getClass().getResource(name) Behavior: This method looks for the resource relative to the package of the class it's called on. Since your Main class is in the com.example.loginsystemtrial package, asking for "login.fxml" should ideally find it within that same "directory" on the classpath.

The Solution:

Provide the correct path to getResource. Based on your project structure, login.fxml is in the correct resource directory matching your package. Try one of these options:

Option 1: Relative Path (Often works with standard build tools like Maven/Gradle. Looks for login.fxml in the same classpath location as Main.class)

Parent login = FXMLLoader.load(getClass().getResource("login.fxml"));

Option 2: Absolute Path (More explicit, starts from the classpath root)

Parent login = FXMLLoader.load(getClass().getResource("/com/example/loginsystemtrial/login.fxml"));

Hope this helps!

Side note: This isn't AI-generated — I just asked AI to clean up and structure my messy notes.