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That happens when the image files are not in the right folder when the program executes.

The compiler can not find a definition of the variable: pnl that is defined in scope (within the same pair of {}) with where it is being used/referenced.

See 3) in post#7. Especially the before...

You changed the name of the class from Window to Note, so that statement is no longer a valid constructor.
Change the name (Window) to match the class name (Note).

See the tutorial:
Providing...

The comments should be on the lines with the } so they can not be separated from them.

Does the code compile without errors now?

The Window method (its really the class constructor) is indented...

Put a comment on the { for the start of the class definition
and a comment on the } at the end of the class definition

Put a comment on the { for the start of a method definition
and a comment...

When trying to fix your problem, did you try this:
It helps if you add a comment on the method's ending } and on a class's ending }.

See the code in post#8 Besides the labels on the } note how...

Post#8 is an example.
Methods can not be defined inside of other methods. Make sure the closing } for a method's definition is present before starting the definition a new method.

Start with...

Did you look at the instructions closely and follow them exactly? {s and }s are easy to miss

The start of the statements that define the constructors and methods in a class should all be in the...

Methods can not be defined inside of other methods. Make sure the closing } for a method's definition is present before starting the definition a new method.

Window is the name of a java SE class. You should use a unique name for your class.

Please copy full text of error message and paste it here.
The message should show the source with a ^ under the location of the error.
Here is a sample from the javac compiler:

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