The comfirm and cancel buttons in the bottom are not showing while the dialog is opening Image here HERE IS MY CODE

 private fun showColorPickerDialog(){
          ColorPickerDialog.Builder(this)
            .setTitle("ColorPicker Dialog")
            .setPreferenceName("ColorPickerDialog")
            .setPositiveButton(getString(R.string.confirm), object : ColorEnvelopeListener {
                override fun onColorSelected(envelope: ColorEnvelope, fromUser: Boolean) {
                    mPickColorButton!!.tag = Color.parseColor(envelope.hexCode.toString())
                    val coltag = mPickColorButton!!.tag.toString()
                    drawingView?.setColor(coltag)
                }
            }).setNegativeButton(getString(R.string.cancel),object : DialogInterface.OnClickListener{
                  override fun onClick(dialog: DialogInterface?, which: Int) {
                      dialog?.dismiss()
                  }
            })
            .attachAlphaSlideBar(true)
            .attachBrightnessSlideBar(true)
              .setBottomSpace(20)
            .show()

    }

The library link :