Java not recognizing custom exception class and not compiling?

Question

I have been working on a program to control an L.E.D. matrix with a RaspberryPi 3B+ and I wanted to structure my program so each Matrix would be an array of MatrixComponents.

package matrixcontroller;

public class MatrixComponent throws Exception{

    private String componentMode; // Defines whether component is an input or output device.
    private String controlType; // For recalling whether component is analog, binary, or PWM.

    public MatrixComponent(String componentMode, String controlType) {
        if (componentMode.toUpperCase().equals("INPUT")) this.componentMode = "INPUT";
        else if (componentMode.toUpperCase().equals("OUTPUT")) this.componentMode = "OUTPUT";
        else throw new InvalidComponentModeException("'" + componentMode + "' is not a valid component mode.");
    }
}

This is what I have started working on so far, but my IDE (Netbeans) is telling me that InvalidComponentModeException is not a class. The problem is that I have a InvalidComponentModeException class in the same package, so I am confused as to why it is not working. Any ideas?

package matrixcontroller;

public class InvalidComponentModeException extends RuntimeException {

    public InvalidComponentModeException(){
        super();
    }

    public InvalidComponentModeException(String message){
        super(message);
    }
}