相关疑难解决方法(0)

我有这个

- (void)loadView {
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString* documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString* databasePath = [documentsPath stringByAppendingPathComponent:@"ProxDeals.db"];
NSError *error;

BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:databasePath];
if (fileExists==TRUE) {
    [[NSBundle mainBundle] loadNibNamed:@"ProxDealsViewController" owner:self options:nil];
}
else {
    NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"ProxDeals.db"];
    NSLog(@"%@",defaultDBPath);
    success = [fileManager copyItemAtPath:defaultDBPath toPath:databasePath error:&error];
    if (!success) {
        NSAssert1(0, @"Failed to create writable database file with message '%@/.", [error localizedDescription]);
    }
    [[NSBundle mainBundle] loadNibNamed:@"UserRegistration" owner:self options:nil];
}

}

而这个错误: …