Standard input is empty

Standard output is empty

gw.lang.parser.exceptions.ParseResultsException: prog.gosu

Errors: 

Expressions in this position must be non-void. [line:1 col:1] in
line 1: print(1 ?+ 3)
Line Number: 1  Column: 1

Expecting reference type, primitive type not allowed here. [line:1 col:7] in
line 1: print(1 ?+ 3) 
Expected Type: Object
Line Number: 1  Column: 7


	at gw.internal.gosu.parser.ParserBase.verifyParsedElement(ParserBase.java:292)
	at gw.internal.gosu.parser.ParserBase.verifyParsedElement(ParserBase.java:263)
	at gw.internal.gosu.parser.GosuClassParser.parseDefinitions(GosuClassParser.java:475)
	at gw.internal.gosu.parser.GosuClass.compileDefinitionsIfNeeded(GosuClass.java:1551)
	at gw.internal.gosu.parser.GosuClass.compileDefinitionsIfNeeded(GosuClass.java:1494)
	at gw.internal.gosu.parser.GosuClass.isValid(GosuClass.java:925)
	at gw.internal.gosu.parser.GosuProgram_Proxy.isValid(gw.internal.gosu.parser.GosuProgram_Proxy:2)
	at gw.internal.gosu.parser.GosuProgramParser.parseExpressionOrProgram(GosuProgramParser.java:229)
	at gw.lang.Gosu.runWithFile(Gosu.java:621)
	at gw.lang.Gosu.start(Gosu.java:140)
	at gw.lang.Gosu.main(Gosu.java:70)