'CrossPlatformInputManager' does not exist in the current context
<p>So I'm working on a project in Unity and this pops up out of the blue.<br />
The console error is:</p>
<blockquote>
<p>Assets/StandardAssets/Vehicles/Aircraft/Scripts/AeroplaneUserControl2Axis.cs(29,27): error CS0103: The name 'CrossPlatformInputManager' does not exist in the current context</p>
</blockquote>
<p>The following is the script to which it is referring:</p>
<pre><code>using System;
using UnityEngine;
using UnityStandardAssets.CrossPlatformInput;

namespace UnityStandardAssets.Vehicles.Aeroplane
{
    [RequireComponent(typeof (AeroplaneController))]
    public class AeroplaneUserControl2Axis : MonoBehaviour
    {
        // these max angles are only used on mobile, due to the way pitch   and roll input are handled
        public float maxRollAngle = 80;
        public float maxPitchAngle = 80;

        // reference to the aeroplane that we're controlling
        private AeroplaneController m_Aeroplane;


        private void Awake()
        {
            // Set up the reference to the aeroplane controller.
            m_Aeroplane = GetComponent&lt;AeroplaneController&gt;();
        }


        private void FixedUpdate()
        {
            // Read input for the pitch, yaw, roll and throttle of the aeroplane.
            float roll = CrossPlatformInputManager.GetAxis(&quot;Horizontal&quot;);
            float pitch = CrossPlatformInputManager.GetAxis(&quot;Vertical&quot;);
            bool airBrakes = CrossPlatformInputManager.GetButton(&quot;Fire1&quot;);

            // auto throttle up, or down if braking.
            float throttle = airBrakes ? -1 : 1;
#if MOBILE_INPUT
            AdjustInputForMobileControls(ref roll, ref pitch, ref throttle);
#endif
            // Pass the input to the aeroplane
            m_Aeroplane.Move(roll, pitch, 0, throttle, airBrakes);
        }


        private void AdjustInputForMobileControls(ref float roll, ref float      pitch, ref float throttle)
        {
            // because mobile tilt is used for roll and pitch, we help out by
            // assuming that a centered level device means the user
            // wants to fly straight and level!

            // this means on mobile, the input represents the *desired* roll angle of the aeroplane,
            // and the roll input is calculated to achieve that.
            // whereas on non-mobile, the input directly controls the roll of the aeroplane.

            float intendedRollAngle = roll*maxRollAngle*Mathf.Deg2Rad;
            float intendedPitchAngle = pitch*maxPitchAngle*Mathf.Deg2Rad;
            roll = Mathf.Clamp((intendedRollAngle - m_Aeroplane.RollAngle),     -1, 1);
            pitch = Mathf.Clamp((intendedPitchAngle -   m_Aeroplane.PitchAngle), -1, 1);

            // similarly, the throttle axis input is considered to be the     desired absolute value, not a relative change to current throttle.
            float intendedThrottle = throttle*0.5f + 0.5f;
            throttle = Mathf.Clamp(intendedThrottle - m_Aeroplane.Throttle,     -1, 1);
        }
    }
}
</code></pre>