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3 errors and 3 warnings found:
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*** Errors ***
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File: C:\Users\Carlos Satres\Documents\SystemandDesign\BinaryTree\BinaryTree.java [line: 76]
Error: Cannot make a...

getting 5 errors now:

Cannot make static reference to the non-static field input
" " list

Cannot make a static reference to the non-static method openFile() from type SystemandDesign.BinaryTree.BinaryTree(same with readFile() and closeFile();

package SystemandDesign.BinaryTree;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.List;
import java.io.ObjectInputStream;

public class BinaryTree{

...