expected function body error

what does Xcode mean when it has a Parse Issue 'expected function body after function declarator'?

here's my codeing--

//

// main.m

// WhatATool

//

// Created by mac on 7/1/11.

// Copyright 2011 __MyCompanyName__. All rights reserved.

//

#import <Foundation/Foundation.h>

//

void PrintPathInfo()

+ (NSString *)stringByExpandingTildeInPath //this is the line the error appears on

{

NSString *path = @"~";

}

int main (int argc, const char * argv[])

{

NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

PrintPathInfo();

PrintProcessInfo();

PrintBookmarkInfo();

PrintIntrospectionInfo();

[pool release];

return 0;

}