gladloadgl

[tbutton]

hello, I cant compile simple app with glad 
    
    
     libs/csfml/csfml
    import libs/glad/gl
    
    
    
    var window = newRenderWindow(videoMode(500, 500), "OpenGL")
    window.verticalSyncEnabled = true
    
    if(not gladLoadGL()):
      echo "error loadeng opengl"
    
    var event: Event
    while window.open:
      while window.pollEvent(event):
        case event.kind
          of EventType.Resized:
            glViewport(0, 0, event.size.width, event.size.height)
          of EventType.Closed:
            window.close()
          else: discard
      
      window.clear Black
      window.display()
    
    window.destroy()
    
    Run

compiler writes: 
    
    
            ... libs\glad\gl.nim(2103, 6) Hint: 'gl.hasExt(extname: 
string)[declared in libs\glad\gl.nim(2103, 5)]' is declared but not used 
[XDeclaredButNotUsed]
            ... main.nim(9, 18) Error: type mismatch: got <>
            ... but expected one of:
            ... proc gladLoadGL(load: proc): bool
            ... expression: gladLoadGL()
    
    Run

why? help me