Instance of a SyntaxTree object is null. I don''t know why.?, JAVA Programming

Assignment Help:

I have been working on my compiler''s parser now. And for some reason i cant make my parse tree printer to work. SyntaxTree keeps on showing as null when i invoke the print() method. Please help me.

This is the whole project file.

https://www.mediafire.com/download.php?2zi6438s67pynv9

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