title: Why I have error "No visible @interface for "NSArray<Employee *>" declares the selector "addObject:"?
body: <p>I need to insert Employee`s name into array, when I do it I receive this error. Whats wrong with my code?</p>
  
  <pre><code>#import "Employee.h"
  
  @interface Organisation : NSObject
  
  -(void) addEmployeeWithName:(NSString *)EmployeesName;
  
  @end
  
  
  @interface Organisation()
  
  @property(strong, nonatomic) NSArray&lt;Employee *&gt; *employees;//     private var
  
  @end
  
  
  @implementation Organisation
  
  -(void) addEmployeeWithName:(NSString *)EmployeesName
  {
      [self.employees addObject:employeeName];// Error apear here
  }
  
  
  @end
  </code></pre>