I keep getting a java.lang.NullPointerException error message for this line in my code. How would I fix it so that it is not pulling from a null variable. I am trying to print a 2-D array maze.

Edit Tools Options String filename = user, nextLine () ; System. out.println("You entered: " + filename); try{ FileReader fileReader = new FileReader(filename); BufferedReader bufferedReader = new BufferedReader (fileReader); //determine maze size String line = bufferedReader , readLine () ; int num0fRows =; int num0 folumns = line. length () ; while(line ! = null) num0 fRows ++; line = bufferedReader , readLine(); \} char[][] maze = new char[num0fRows][num0fColumns]; for (int i=0;i