mensagens de erro no console

Assets\ControlEnemy.cs(5,7): error CS0116: A namespace cannot directly contain members such as fields or methods

NullReferenceException: Object reference not set to an instance of an object UnityEditor.Scripting.ScriptCompilation.CSharpNamespaceParser.FindClassAndNamespace (System.String className, System.String source, System.Boolean acceptStruct) (at :0) UnityEditor.Scripting.ScriptCompilation.CSharpNamespaceParser.FindNamespace (System.String sourceCode, System.String className, System.Boolean acceptStruct, System.String[] defines) (at :0) Rethrow as IllegalNamespaceParsing: Searching for classname: 'ControlEnemy' caused error in CSharpNameParser UnityEditor.Scripting.ScriptCompilation.CSharpNamespaceParser.FindNamespace (System.String sourceCode, System.String className, System.Boolean acceptStruct, System.String[] defines) (at :0) UnityEditor.Scripting.ScriptCompilation.CSharpNamespaceParser.GetClassAndNamespace (System.String sourceCode, System.String className, System.String& outClassName, System.String& outNamespace, System.String[] defines) (at :0) UnityEditor.Scripting.Compilers.CSharpLanguage.GetClassAndNamespace (System.String filePath, System.String definedSymbols, System.String& outClassName, System.String& outNamespace) (at :0) UnityEditor.Scripting.ScriptCompilers.GetClassAndNamespace (System.String file, System.String definedSymbols, System.String& outClassName, System.String& outNamespace) (at :0)

Assets\ControlEnemy.cs(5,7): error CS0116: A namespace cannot directly contain members such as fields or methods

meu codigo:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

 void FixedUpdate()
    {
        GetComponent<Rigidbody>().MovePosition
            (GetComponent<Rigidbody>().position + 
            Myriah.transform.position);
    }

    public class ControlEnemy : MonoBehaviour {

    public GameObject Myriah;
        public float Velocidade = 5;

    void Start () {

    }

    void Update () {

    }

    void FixedUpdate()
    {
        Vector3 direcao = Myriah.transform.position - transform.position;
        GetComponent<Rigidbody>().MovePosition
            (GetComponent<Rigidbody>().position + 
            direcao.normalized * Velocidade * Time.deltaTime);
    }
}