“collect2：LD返回1退出状态”错误iPhone SDK。请帮我(“collect2:

我是新的Mac和iPhone SDK。我写basicly游戏应用。我想更新和使用SQLite显示游戏得分。

我搜索在网上寻找我的问题，但我没有找到我的任何解决方案。错误的是：

Ld /Users/Iphone/Desktop/IDRGame/build/Debug-iphonesimulator/IDRGame.app/IDRGame normal i386
cd /Users/Iphone/Desktop/IDRGame
setenv MACOSX_DEPLOYMENT_TARGET 10.5
setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.0 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator2.2.1.sdk -L/Users/Iphone/Desktop/IDRGame/build/Debug-iphonesimulator -L/Users/Iphone/Desktop/IDRGame -L/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator2.2.1.sdk/System/Library/Frameworks/QuartzCore.framework -F/Users/Iphone/Desktop/IDRGame/build/Debug-iphonesimulator -F/Users/Iphone/Desktop/IDRGame -filelist /Users/Iphone/Desktop/IDRGame/build/IDRGame.build/Debug-iphonesimulator/IDRGame.build/Objects-normal/i386/IDRGame.LinkFileList -mmacosx-version-min=10.5 -framework Foundation -framework UIKit -framework CoreGraphics -framework AudioToolbox -lsqlite3.0 -o /Users/Iphone/Desktop/IDRGame/build/Debug-iphonesimulator/IDRGame.app/IDRGame
Undefined symbols:
".objc_class_name_ScoreDB", referenced from:
literal-pointer@__OBJC@__cls_refs@ScoreDB in IDRGameAppDelegate.o
literal-pointer@__OBJC@__cls_refs@ScoreDB in InterclockView.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

我有一个SQLite的ScoreDB.h和ScoreDB.m文件。 ScoreDB.h文件

//
// ScoreDB.h
// SQLiteTutorial
//
// Created by Iphone App on 6/11/09.
// Copyright 2009 __MyCompanyName__. All rights reserved.
//
#import <UIKit/UIKit.h>
#import <sqlite3.h>

@interface ScoreDB : NSObject {
NSInteger *game_id;
NSString *name;
NSString *score;

BOOL hydrated;
BOOL dirty;
}

@property (nonatomic, readonly) NSInteger *game_id;
@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *score;
@property (nonatomic, readwrite) BOOL dirty;
@property (nonatomic, readwrite) BOOL hydrated;

- (id)initWithPrimaryKeyNSInteger)pk;
-(void)UpdateDatabase;
-(void)SelectDatabase;
+ (void) finalizeStatements;
@end

和ScoreDB.m

#import "ScoreDB.h"
static sqlite3 *database = nil;
static sqlite3_stmt *insert_statement = nil;
static sqlite3_stmt *init_statement = nil;
static sqlite3_stmt *delete_statement = nil;
static sqlite3_stmt *hydrate_statement = nil;
static sqlite3_stmt *dehydrate_statement = nil;
static sqlite3_stmt *update_statement = nil;

@implementation ScoreDB
@synthesize game_id,name,score,dirty,hydrated;

- (id)initWithPrimaryKeyNSInteger)pk{    
[super init];
game_id = pk;
return self;
}

// Finalize (delete) all of the SQLite compiled queries.
+ (void)finalizeStatements {
if (database) sqlite3_close(database);
if (insert_statement) {
sqlite3_finalize(insert_statement);
insert_statement = nil;
}
if (init_statement) {
sqlite3_finalize(init_statement);
init_statement = nil;
}
if (delete_statement) {
sqlite3_finalize(delete_statement);
delete_statement = nil;
}
if (hydrate_statement) {
sqlite3_finalize(hydrate_statement);
hydrate_statement = nil;
}
if (dehydrate_statement) {
sqlite3_finalize(dehydrate_statement);
dehydrate_statement = nil;
}

if (update_statement) {
sqlite3_finalize(update_statement);
update_statement = nil;
}
}

-(void)UpdateDatabase {
delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
[alert show];

if(update_statement == nil) {
const char *sql = "UPDATE game Set score = ? Where name = ?";
if(sqlite3_prepare_v2(database, sql, -1, &updateStmt, NULL) != SQLITE_OK)
NSAssert1(0, @"Error while creating update statement. '%s'",
          sqlite3_errmsg(database));
}

sqlite3_bind_text(update_statement, 1,
                 [name UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(update_statement, 2,
                 [score UTF8String], -1, SQLITE_TRANSIENT);
// sqlite3_bind_int(update_statement, 3, coffeeID);

if(SQLITE_DONE != sqlite3_step(update_statement))
NSAssert1(0, @"Error while updating. '%s'", sqlite3_errmsg(database));

sqlite3_reset(update_statement);

//Reclaim all memory here.
[score release];
score = nil;
[name release];
name = nil;

}

-(void)SelectDatabase {}

- (void) setGameNameNSString *)newValue {
[name release];
name = [newValue copy];
}

- (void) setGameScoreNSString *)newValue {
[score release];
score = [newNumber copy];
}

- (void)dealloc {
[name release];
[score release];
[super dealloc];
}
@end

和我使用的代码

IDRGameAppDelegate *appDelegate =
         (IDRGameAppDelegate *)[[UIApplication sharedApplication] delegate];


ScoreDB *dbObj = [[ScoreDB alloc] initWithPrimaryKey:0];
dbObj.name = @"reflex";
dbObj.score = @"0.345";

[appDelegate updateScore:dbObj];

当我关闭这条线： ScoreDB *dbObj = [[ScoreDB alloc] initWithPrimaryKey:0]; 错误消失。是什么问题，我不明白。请帮我。我的框架：