lost in gnustep first steps

[reuss]

I am trying to use the gnustep classes for making a little, editable
dictionary (to use my "|" delimited vocabulary (NSDictionary is not good
for that purpose, because there are multiple records with same key), but
my first essays does not want to work as I espect. I have errors at
runtime that I don't really understand. my intention is to put a word to
a Dico object in the variable "egy". Maybe I am a complete idiot, but I
don't understand what happens (I am an absolutly beginner in objective-c - the 
basic objc
seems me more clear, but i want a gui for my app),
cheers
andras

errors
-------
Jun 04 20:30:05 szotar[1501] Invalid selector addEgy: (no type information)
Jun 04 20:30:05 szotar[1501] GSFFCallInvocation.m:771  Assertion failed in 
GSInvocationCallback.  No signature for selector addEgy:
Uncaught exception NSInternalInconsistencyException, reason: 
GSFFCallInvocation.m:771  Assertion failed in GSInvocationCallback.  No 
signature for selector addEgy:


dico.h
------------
#import <Foundation/NSObject.h>
#import <Foundation/NSMutableString.h>

@interface Dico: NSObject
{
NSMutableString *egy;
}
+ (id) new;
- (void) setEgy: one;
@end

dico.m
-------------
#include "dico.h"

@implementation Dico
+ (id) new
        {
        self=[[super alloc] init];
        egy = "";
        return self;
}
- (void) setEgy: (NSMutableString *)one
        {
        [one retain];
        [egy release];
        egy = one;
        }
@end

main.m
------------
#import <Foundation/NSObject.h>
#import <Foundation/NSAutoreleasePool.h>
#import <Foundation/NSMutableString.h>
#import "dico.h"

void main()
{
NSAutoreleasePool *pool;
pool = [NSAutoreleasePool new];
id szotar = [Dico new];
[szotar addEgy: "nagzo ddf"];
}