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Hello I Am Trying To Find The Problem With The Following Program, It Is Suppose To Be A Skill Tree.

digraph unix {
node [color=blue, style=filled, shape=star];
“Parthenon”
“Hagia Sophia”
“Spiral Minaret”
node [color=yellow, style=filled, shape=star];
“Great Library”
“SETI”
“CERN”
node [color=red, style=filled, shape=star];
“Great Lighthouse”
“Manhattan Project”
“Great Wall”
node [color=orange, style=filled, shape=star];
“Taj Mahal”
“Silk Road”
“Apollo Program”
“Nuclear Defence”
node [color=green, style=filled, shape=star];
node [color=purple, style=filled, shape=star];
node [color=white, style=filled, shape=star];
node [color=blue, style=filled];
“Polytheism”
“Basic Religion”
“Organized Religion”
“Astronomy”
node [color=yellow, style=filled];
“Animal Husbandry”
"Basic Tools Two"
"Basic Tools Three"
“Advanced Tools One”
“Advanced Tools Two”
“Advanced Tools Three”
"Herbology"
“Mining One”
“Mining Two”
“Mining Three”
“Mathematics”
“Architectural Mathematics”
“Advanced Math”
“Physics”
“Basic Agriculture”
“Advanced Agriculture”
“Wood Cutting”
“Weaving”
“Alphabet”
“Writing”
“Paper”
“Scientific Method”
“Printing Press”
“Unification”
“Feudalism”
“Monarchy”
“Republic”
“Democracy”
“Capitalism”
“Corporation”
“Theocracy”
“Communism”
“Bureaucracy One”
“Bureaucracy Two”
“Bureaucracy Three”
“Advanced Clothing”
“Electricity”
“Advanced Mining One”
“Advanced Mining Two”
“Advanced Mining Three”
“Stone Working”
“Patents”
“Masonry”
“Compass”
“Optics”
“Exploration”
“Industrialization (5)”
“Replaceable parts”
“Medicine One”
“Medicine Two“
“Medicine Three”
“Sanitation”
“Circuits (3)”
“Computers”
“Ecology”
“Fiber Optics”
“Genetics”
“Refining”
“Purification”
“Apollo program”
“Internet”
node [color=red, style=filled];
"Archery"
“Calvary”
“Gunpowder”
“Rifling”
“Gun Forging”
“Organized Military”
“Military Tactics One”
“Military Tactics Two”
“Military Tactics Three”
“Siege Constructs”
“Modern Siege Constructs”
“Amphibious Warfare”
“Naval Assault”
“Biological Warfare”
node [color=orange, style=filled];
“Iron Working”
“Steel Working”
“The Wheel”
“Rafts”
“Ships”
“Metal Ships”
“Combustion”
“Machinery”
“Advanced Machinery”
“Phlebotinum Machinery”
“Chemistry”
“Steam Power”
“Invention”
“Rocketry(10)”
“Targeting(10)”
“Uranium”
“Fission”
“Thermonuclear Weaponry”
“Nuclear Deterrent”
“Nuclear Defence”
“Electro-Magnetic Pulse”
“Space Race”
“Rocket fuel”
“Satellites”
“Rocketry(10)”
“Targeting(10)”
“Fission”
node [color=green, style=filled];
“Philosophy”
“Alchemy”
node [color=purple, style=filled];
node [color=white, style=filled];
"Fire"
"Basic Tools One"
"Hunting & Gathering"
“Language”
“Anarchy”
node [color=black, style=filled];
"Basic Tools One" -> "Basic Tools Two" -> "Basic Tools Three" -> "Archery"
"Hunting & Gathering" -> Herbology" -> “Weaving” -> “Advanced Clothing”
"Basic Tools Three” -> “Mining One” -> “Mining Two” -> “Mining Three”
“Mining Two” -> “Iron Working”
“Better Tools Three” -> “Iron Working” -> “Machinery” -> “Printing Press”
“Better Tools Three” -> “The Wheel”
“Mathematics” -> “Writing” -> “Architectural Mathematics” -> “Advanced Math” -> “Physics” -> “Scientific Method” -> “Alchemy” -> “Chemistry” -> “Medicine Three”
“Better Tools One” -> “Weaving”
“Better Tools Three ” -> “Rafts”
“Better Tools Three ” -> “Basic Agriculture” -> “Advanced Agriculture” -> “Animal Husbandry” -> “Calvary”
“Better Tools Three ” -> “Wood Cutting” -> “Paper”
“Better Tools Three ” -> “Advanced Tools One” -> “Advanced Tools Two” -> “Advanced Tools Three”
“Iron Working” -> “Advanced Tools One”
“Wood Cutting” -> “Rafts”
“Mathematics” -> “Rafts” -> “Ships” -> “Naval Assault”
“Anarchy” -> “Unification” -> “Alphabet” -> “Writing” -> “Paper”
“Language” -> “Alphabet”
“Math” -> “Printing Press”
“Wood Cutting” -> “Printing Press”
“Language” -> “Polytheism”
“Unification” -> “Basic Religion”
“Writing” -> “Organized Religion”
“Scientific Method” -> “Chemistry” -> “Gun Powder”
“Machinery” -> “Gunpowder” -> “Rifling” -> “Gun Forging” -> “Modern Siege Constructs”
“Bureaucracy” -> “Philosophy”
“Unification” -> “Feudalism” -> “Monarchy” -> “Republic” -> “Democracy”
“Feudalism” -> “Bureaucracy” -> “Bureaucracy Two”
“Machinery” -> “Advanced Machinery” -> “Compass” -> “Exploration”
“Writing” -> “Bureaucracy Two” -> “Bureaucracy Three” -> “Steel Working”
“Monarchy” -> “Bureaucracy Three” -> “Exploration” -> “Rafts”
“Optics” -> “Exploration”
“Mining Three” -> “Steam Power” -> “Electricity” -> “Steel Working”
“Advanced Machinery” -> “Steam Power”
“Mining Three” -> “Advanced Mining One” -> “Advanced Mining Two” -> “Advanced Mining Three”
“Machinery” -> “Stone Working” -> “Masonry”
“Mining One” -> “Stone Working”
“Iron Working” -> “Steel Working”
“Bureaucracy Three” -> “Patents” -> “Invention” -> “Optics”
“Electricity” -> “Patents”
“Electricity” -> “Phlebotinum Machinery”
“Advanced Machinery” -> “Phlebotinum Machinery”
“Invention” -> “Gun Forging”
“Bureaucracy Three” -> “Capitalism”
“Industrialization (5)” -> “Capitalism”
“Unification” -> “Organized Military” -> “Military Tactics One” -> “Military Tactics Two” -> “Military Tactics Three”
“Bureaucracy Three” -> “Industrialization (5)” -> “Replaceable Parts” -> “Amphibious Warfare”
“Exploration” -> “Industrialization (5)” -> “Advanced Mining One”
“Electricity” -> “Industrialization (5)” -> “Circuits (3)”
“Gun Forging” -> “Industrialization (5)” -> “Corporation
“Invention” -> “Industrialization (5)” -> “Advanced Mining Two”
“Herbology” -> “Medicine One” ” -> “Medicine Two” -> “Medicine Three” -> “Sanitation” -> Ecology” -> “Fission” -> “Advanced Mining Three” -> “Purification”
“Alchemy” -> “Medicine Two”
“Archery” -> “Siege Constructs”
“Replaceable Parts” -> “Combustion” -> “Naval Assault”
“Advanced Mining Two” -> “Combustion”
“Patents” -> “Circuits (3)”
“Electricity” -> “Circuits (3)” -> “Computers” -> “Fiber Optics” -> “The Intranet”
“Computers” -> “Rocketry (10)” -> “Rocket Fuel”
“Advanced Mining Three” -> “Rocketry (10)” -> “Targetting (10)” -> “Fission”
“Sanitation” -> “Genetics”
“Computers” -> “Fission”
“Industrialization (5)” -> “Refining” -> “Purification”
“Computers” -> “Purification” -> “Fission”
“Fission” -> “Manhattan Project” -> “Thermonuclear Weaponry” -> “Nuclear Deterrent” -> “Nuclear Defence” -> “Electro-Magnetic Pulse”
“Advanced Mining Three” -> Apollo Program” -> “Space Race”
“Rocketry” -> “Satellites” -> “Apollo Program”
“Monarchy” -> “Communism”
“Industrialization (5)” -> “Communism”
“Rafts” -> “Astronomy”
“Philosophy” -> “Astronomy”
“Advanced Mathematics” -> “Astronomy”
“Sanitation” -> “Biological Warfare”
“Organized Religion” -> “Parthenon”
“Organized Religion” -> “Hagia Sophia”
“Organized Religion” -> “Spiral Minaret”
“Computers” -> “SETI”
“Writing” -> “Great Library”
“Masonry” -> “Great Wall”
“Calvary” -> “Great Lighthouse”
“Paper” -> “Great Lighthouse”
“Electricity” -> “Great Lighthouse”
“Astronomy” -> “Silk Road”
“SETI” -> “CERN”
}

You have some unclosed string

You have some unclosed string constants:

 

"Hunting & Gathering" -> Herbology" -> "Weaving" -> "Advanced Clothing"

                                        ^
"Gun Forging" -> "Industrialization (5)" -> "Corporation

                                                                                      ^
"Advanced Mining Three" -> Apollo Program" -> "Space Race"

                                             ^

 

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