# Unity script error (620759)
**URL:** https://discussions.unity.com/t/unity-script-error-620759/620759
**Category:** Scripting
**Tags:** Scripting
**Created:** [March 17, 2016, 10:09pm UTC](https://discussions.unity.com/t/unity-script-error-620759/620759 "2016-03-17T22:09:49Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@halojman](https://discussions.unity.com/u/halojman)
#### Post date: [March 17, 2016, 10:09pm UTC](https://discussions.unity.com/t/unity-script-error-620759/620759/1 "2016-03-17T22:09:49Z")
I’m currently working on a project, But I’ve ran into an error. I have no clue how to fix it, these are my errors:
**Assets/Standard Assets/CrossPlatformInput/Scripts/AxisTouchButton.cs(3,19): error CS0234: The type or namespace name `EventSystems' does not exist in the namespace `UnityEngine’. Are you missing an assembly reference?**
**Assets/Standard Assets/CrossPlatformInput/Scripts/AxisTouchButton.cs(7,55): error CS0246: The type or namespace name `IPointerDownHandler' could not be found. Are you missing a using directive or an assembly reference?** **Assets/Standard Assets/CrossPlatformInput/Scripts/AxisTouchButton.cs(7,76): error CS0246: The type or namespace name `IPointerUpHandler’ could not be found. Are you missing a using directive or an assembly reference?**
**Assets/Standard Assets/CrossPlatformInput/Scripts/Joystick.cs(3,19): error CS0234: The type or namespace name `EventSystems' does not exist in the namespace `UnityEngine’. Are you missing an assembly reference?**
**Assets/Standard Assets/CrossPlatformInput/Scripts/Joystick.cs(7,48): error CS0246: The type or namespace name `IPointerDownHandler’ could not be found. Are you missing a using directive or an assembly reference?**
**Assets/Standard Assets/CrossPlatformInput/Scripts/Joystick.cs(7,69): error CS0246: The type or namespace name `IPointerUpHandler’ could not be found. Are you missing a using directive or an assembly reference?**
**ssets/Standard Assets/CrossPlatformInput/Scripts/Joystick.cs(7,88): error CS0246: The type or namespace name `IDragHandler' could not be found. Are you missing a using directive or an assembly reference?** **Assets/Standard Assets/CrossPlatformInput/Scripts/TouchPad.cs(3,19): error CS0234: The type or namespace name `EventSystems’ does not exist in the namespace `UnityEngine'. Are you missing an assembly reference?** **Assets/Standard Assets/CrossPlatformInput/Scripts/TouchPad.cs(4,19): error CS0234: The type or namespace name `UI’ does not exist in the namespace `UnityEngine'. Are you missing an assembly reference?** **Assets/Standard Assets/CrossPlatformInput/Scripts/TouchPad.cs(9,48): error CS0246: The type or namespace name `IPointerDownHandler’ could not be found. Are you missing a using directive or an assembly reference?**
**Assets/Standard Assets/CrossPlatformInput/Scripts/TouchPad.cs(9,69): error CS0246: The type or namespace name `IPointerUpHandler’ could not be found. Are you missing a using directive or an assembly reference?**
**Assets/Standard Assets/Utility/EventSystemChecker.cs(4,19): error CS0234: The type or namespace name `EventSystems' does not exist in the namespace `UnityEngine’. Are you missing an assembly reference?**
**Assets/Standard Assets/Utility/FPSCounter.cs(3,19): error CS0234: The type or namespace name `UI' does not exist in the namespace `UnityEngine’. Are you missing an assembly reference?**
My Script is:
```csharp
using System;
using UnityEngine;
using UnityEngine.EventSystems;
namespace UnityStandardAssets.CrossPlatformInput
{
public class AxisTouchButton : MonoBehaviour, IPointerDownHandler, IPointerUpHandler
{
// designed to work in a pair with another axis touch button
// (typically with one having -1 and one having 1 axisValues)
public string axisName = "Horizontal"; // The name of the axis
public float axisValue = 1; // The axis that the value has
public float responseSpeed = 3; // The speed at which the axis touch button responds
public float returnToCentreSpeed = 3; // The speed at which the button will return to its centre
AxisTouchButton m_PairedWith; // Which button this one is paired with
CrossPlatformInputManager.VirtualAxis m_Axis; // A reference to the virtual axis as it is in the cross platform input
void OnEnable()
{
if (!CrossPlatformInputManager.AxisExists(axisName))
{
// if the axis doesnt exist create a new one in cross platform input
m_Axis = new CrossPlatformInputManager.VirtualAxis(axisName);
CrossPlatformInputManager.RegisterVirtualAxis(m_Axis);
}
else
{
m_Axis = CrossPlatformInputManager.VirtualAxisReference(axisName);
}
FindPairedButton();
}
void FindPairedButton()
{
// find the other button witch which this button should be paired
// (it should have the same axisName)
var otherAxisButtons = FindObjectsOfType(typeof(AxisTouchButton)) as AxisTouchButton[];
if (otherAxisButtons != null)
{
for (int i = 0; i < otherAxisButtons.Length; i++)
{
if (otherAxisButtons[i].axisName == axisName && otherAxisButtons[i] != this)
{
m_PairedWith = otherAxisButtons[i];
}
}
}
}
void OnDisable()
{
// The object is disabled so remove it from the cross platform input system
m_Axis.Remove();
}
public void OnPointerDown(PointerEventDat data)
{
if (m_PairedWith == null)
{
FindPairedButton();
}
// update the axis and record that the button has been pressed this frame
m_Axis.Update(Mathf.MoveTowards(m_Axis.GetValue, axisValue, responseSpeed * Time.deltaTime));
}
public void OnPointerUp(PointerEventData data)
{
m_Axis.Update(Mathf.MoveTowards(m_Axis.GetValue, 0, responseSpeed * Time.deltaTime));
}
}
}
```
Can someone help me fix the errors, and explain what they are?
---
### Author:  [@alexzzzz](https://discussions.unity.com/u/alexzzzz)
#### Post date: [March 17, 2016, 10:53pm UTC](https://discussions.unity.com/t/unity-script-error-620759/620759/2 "2016-03-17T22:53:21Z")
I would guess that your project doesn’t reference UnityEngine.UI.dll.
---
### Author:  [@Kiwasi](https://discussions.unity.com/u/Kiwasi)
#### Post date: [March 18, 2016, 2:42am UTC](https://discussions.unity.com/t/unity-script-error-620759/620759/3 "2016-03-18T02:42:49Z")
> [@alexzzzz](#):
>
> I would guess that your project doesn’t reference UnityEngine.UI.dll.
This. What version of Unity are you using?
---
### Author:  [@Abhiroop-Tandon](https://discussions.unity.com/u/Abhiroop-Tandon)
#### Post date: [September 20, 2016, 11:26pm UTC](https://discussions.unity.com/t/unity-script-error-620759/620759/4 "2016-09-20T23:26:06Z")
I am having the same issue and i am using Unity5.4.1
how did you fix it ??
---
### Author:  [@Vedrit](https://discussions.unity.com/u/Vedrit)
#### Post date: [September 20, 2016, 11:52pm UTC](https://discussions.unity.com/t/unity-script-error-620759/620759/5 "2016-09-20T23:52:24Z")
Include
`using UnityEngine.UI;` in your script, if I understand correctly
---
### Author:  [@Abhiroop-Tandon](https://discussions.unity.com/u/Abhiroop-Tandon)
#### Post date: [September 21, 2016, 11:28am UTC](https://discussions.unity.com/t/unity-script-error-620759/620759/6 "2016-09-21T11:28:08Z")
> [@Vedrit](#):
>
> Include
> `using UnityEngine.UI;` in your script, if I understand correctly
Closing unity and opening it again fixed for me hahaha. Thanks for the reply though, i’ll try it next time i get them. It was only coming when i was building the project