Grade Book class, please help

I have to do a multiclass program and there's a logic error that I can't figure out.

public void inputStudents() throws FileNotFoundException //This will work to interactively input Students
{

Scanner inF = new Scanner(new File("C:\\Users\\Caili\\Documents\\Sophmore\\AP Computer Science\\Unit 4\\TextFile.txt"));
while(inF.hasNextLine( ))
{

Student aStudent = new Student();

aStudent.inputInfo("Name",inF.nextLine( ));
aStudent.inputInfo("Tests",inF.nextLine( ));
aStudent.inputInfo("Programs",inF.nextLine( ));
aStudent.inputInfo("Homework",inF.nextLine( ));

aStudent.computeAve();
aStudent.computeGrade();
myStudents.add(aStudent); It says that this line is null when I try to run it.

}

I have this that goes along with the method

public void inputInfo(String scoresType,String info)
{
if(scoresType.equals("Name"))
myName = info;
else if(scoresType.equals("Tests"))
myTests.getScores(info);
else if(scoresType.equals("Programs"))
myProgs.getScores(info);
else if(scoresType.equals("Homework"))
myHk.getScores(info);
}


public void getScores(String lineNumbers) //Interactively read scores from the keyboard into an array (-999 terminates input)
{
Scanner lineScan = new Scanner(lineNumbers);
while(lineScan.hasNext())
{
int num = lineScan.nextInt();
myScores[mySize] = num;
mySize++;
}
}

Does the variable myStudents have a valid value or is its value null?

Where do you define it and where do you give it a value?

I declare it in the constucter
public ClassList()
{
ArrayList<Student> myStudents = new ArrayList<Student>();
int[] myGradeDistribution = new int[GREATEST_SIZE];
count = 0;
scoreSum = 0;
additional = 0;
}

Quote:

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myStudents.add(aStudent); It says that this line is null

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Please post the full text of the error message. Your edited version is leaving off valuable information.

in the Classlist class it says :java.lang.NullPointerException: null

Please post the FULL text of the error message. Your edited version is leaving off important information.