BCE0051 Error

[Crax]

I have this code:

#pragma strict
var difficulty:String;
var val1:float = 10;
var val2:float = 10;
var val3:float = 10;
var val4:float = 10;
var customskin:GUISkin;
var stile:GUIStyle;
var banner:Texture2D;
var start:Texture2D;
var options:Texture2D;
var credits:Texture2D;
var diff:String=PlayerPrefs.GetString("difficulty");
enum MainMenu {Main,Options, Credits}
var menu = MainMenu.Main;

function OnGUI () {
GUI.skin=customskin;
switch (MainMenu) {
 case MainMenu.Main:
    GUI.DrawTexture(Rect(150,55,580,130), banner);
    if(GUI.Button(Rect (300, 300, 219, 58), start, "buttonstart" )){
    LevelChecker();
 
}
if(GUI.Button(Rect(300,370,219,58),options, "buttonoptions")){
     menu=MainMenu.Options;
}
if(GUI.Button(Rect(300,440,219,58),credits,"buttoncredits")){
     menu=MainMenu.Credits;
}
GUI.Label(Rect(750,580,240,20), "©447261676D65746F68656C6C");
break;
    case MainMenu.Options:

    GUI.DrawTexture(Rect(150,55,580,130), banner);
    if (GUI.Button(Rect(300,200,219,58), options, "buttonoptions")){
       menu = MainMenu.Main; }
    if (GUI.Button(Rect(630,290,130,50), difficulty)){
       PlayerPrefs.SetString("difficulty","easy");
         difficulty=PlayerPrefs.GetString("difficulty");
    if (difficulty=="easy"){
       difficulty="hard";
         PlayerPrefs.SetString("difficulty", difficulty); }
    else if (difficulty=="hard") {
       difficulty="fearless";
         PlayerPrefs.SetString("difficulty", difficulty); }
    else (difficulty=="fearless");
       difficulty="easy";
         PlayerPrefs.SetString("difficulty", difficulty); }
    break;
    case MainMenu.Credits:
       GUI.skin=customskin;
       GUI.Label (Rect(val1,val2,val3,val4), "Testo di prova");
    break;
}
}
function LevelChecker () {

    if (diff=="easy") {
    Application.LoadLevel("nighthouse"); }
    else if (diff=="hard") {
    Application.LoadLevel("nighthouse"); }
    else if (diff=="fearless"){
    Application.LoadLevel("nighthouse"); }

}

But in the Console i get this error:

BCE0051: Operator '==' cannot be used with 
a left hand side of type 'System.Type' and a right hand side of type 'MainMenu'.

How can i fix it?

[Graham-Dunnett]

So, the error message you get will come with two numbers in brackets. You have chosen to not supply this information, which makes helping you somewhat difficult. The first of these two numbers is the line number that has the problem. With this information you should trivially be able to work out the problem. Double-clicking on the error message in Unity should even open MonoDevelop and position the cursor on the line.

My guess about what your problem is is that your variable menu does not have a type. You use this somewhere, perhaps in the switch statement, and the compiler doesn’t know that menu is meant to be a MainMenu.