unexpected $end

[Gianni Bertoni]

Hi, Your program seems very nice . But doing some tests I stopped in front of 
this example

{ c’4 e’ g’}

I processed this file and the program returns me this message
Whath is wrong in my test?
Thank you in advance for answer
Gianni 

# -*-compilation-*-
Changing working directory to `D:/lilypond'
Processing `D:/lilypond/provaok.ly'
Parsing...
D:/lilypond/provaok.ly:1:3: error: syntax error, unexpected $end
{ c
   ’4 e’ g’}