Xcode Don't recognize Object anymore - ios

Question

I have an object named friend (I know, first letter should be uppercase). I use this class in many other classes and view controller.
All of a sudden, without changing ANY CODE, every custom object I have, stopped recognize each other. I always get the error Unknown type name "friend".
I already tried to clear the project and restart the mac.
WTF is wrong with this Xcode? All of a sudden my whole project stops working.
Here is my class currentUser.h
#import <Foundation/Foundation.h>
#import "friend.h"
#interface currentUser : NSObject<NSCoding>
{
BOOL fromfacebook;
#private
NSMutableArray *upLoadStack;
}
#property (nonatomic,strong)NSString *token;
#property (nonatomic,strong)NSString *email;
#property (nonatomic,strong)NSString *name;
#property (nonatomic,strong)UIImage *userImg;
#property (nonatomic,strong)NSString *username;
#property (nonatomic,strong)NSString *facebookID;
#property (nonatomic,strong)NSString *userPSW;
#property (nonatomic,strong)NSString *userID;
#property (nonatomic,strong)NSMutableArray *friendsList;
#property (nonatomic,strong)NSMutableArray *groups;
#property (nonatomic,strong)NSData *audioMessage;
#property (nonatomic,strong)NSMutableArray *mimosToDownload;
#property (nonatomic,strong)NSMutableArray *mimosDownloaded;
#property (nonatomic,strong)friend *friendToSend; //Here is where a I get the error of unknown type name
#end
this is the friend.h
#import <Foundation/Foundation.h>
#import "currentUser.h"
#import "Imager.h"
#interface friend : NSObject<NSCoding>
#property (nonatomic,strong)NSString *username;
#property (nonatomic,strong)NSString *userID;
#property (nonatomic,strong)UIImage *userImg;
#property(nonatomic,strong)NSMutableData *buffer;
#property(nonatomic)BOOL flagDownloaded;
-(UIImage*)downloadImageBlocked;
-(id)init;
-(UIImage*)getFriendImg;
-(UIImage*)userImg;
-(NSString*)getUserID;
-(NSString*)getUserName;
- (void)encodeWithCoder:(NSCoder *)encoder;
-(bool)isNil;
#end

Answer 1

fix the stuff that you know is wrong first...
change
#interface currentUser : NSObject<NSCoding>
{
BOOL fromfacebook;
#private
NSMutableArray *upLoadStack;
}
to
#interface User : NSObject<NSCoding>
{
BOOL fromfacebook;
#private
NSMutableArray *upLoadStack;
}
you don't need to know if the user is current or not for the user to have properties of a user, think of them as actually representing objects.
change:
#interface friend : NSObject<NSCoding>
to
#interface Friend : NSObject<NSCoding>
you know it is wrong, fix it now before you have to fix it in 1000 places instead of 100 places.
Convention is very important in Objective-C.
also don't import everything into your header if you don't need to...
#class Friend; //forward class declaration
#interface currentUser : NSObject<NSCoding>
...
#property (nonatomic,strong)Friend *friendToSend; //Here is where a I get the error of unknown type name
and as for your ivar's in currentUser you don't need those in the interface (they can go in a block after the #implimentation line), unless you need them for backwards compatibility...