"ChatManager.h" file not found

[Xero8k]

Hi i'm getting an issue where my xcode can't seem to find the ChatManager.h file
#import "AppDelegate.h"
#import "ChatManager.h" <----- 'ChatManager.h' file not found
#import "ChatUIManager.h"
#import "ChatUser.h"
#import "ChatAuth.h"
@import Firebase;