Player controllers already exist issue

Hello,

I PhotonNetwork.Instantiate my player and seperately PhotonNetwork.Instantiate the controls (Canvas UI button, joystick for mobile game).

When 1 player is in the room alone all is fine.

When a player joins I get an error that the player controls already exist. This causes the original and newly joined character to lose all their controls (ie buttons/joystick don't work).

I tried combining the controls into the player prefab but since it's a canvas that didn't work.

How can I fix this?

Update:

This is what I do to find the controls to use in player script:

void Start ()
{
m_PhotonView = GetComponent<PhotonView> ();

if( m_PhotonView.isMine == true )
{
FlyJoystick = GameObject.Find("FlyJoystickInstNet").GetComponent<ETCJoystick>();
FlyJoystick.onMove.AddListener( On_Move_Flyjoystick);
FlyJoystick.onMoveEnd.AddListener( On_Move_End_Flyjoystick);


landButton = GameObject.Find("landButtonInstNet").GetComponent<ETCButton>();
landButton.onUp.AddListener( On_LandButton_Up);


flyButton = GameObject.Find("flyButtonInstNet").GetComponent<ETCButton>();
flyButton.onUp.AddListener(On_FlyButton_Up );

fireButton = GameObject.Find("fireButtonInstNet").GetComponent<ETCButton>();
fireButton.onDown.AddListener(fireHandler );

ForceSlider = GameObject.Find("SliderInstNet").GetComponent<Slider>();
}
}