Need Help Exception at Public Game1() in MonoGame on OSX - macos

Question

So I'm trying to create this program that works perfect in Visual Studio 2012 at School.
But when I'm at home it's giving me this Thrown Exception error at Public Game1().
Hopefully someone can help me out with this so that way i can actually run my program and finish it.
The Call Stack is:
System.NullReferenceException: Object reference not set to an instance
of an object at Microsoft.Xna.Framework.OpenTKGameWindow.Initialize
() [0x00000] in :0 at
Microsoft.Xna.Framework.OpenTKGameWindow..ctor () [0x00000] in
:0 at
Microsoft.Xna.Framework.OpenTKGamePlatform..ctor
(Microsoft.Xna.Framework.Game game) [0x00000] in :0
at Microsoft.Xna.Framework.GamePlatform.Create
(Microsoft.Xna.Framework.Game game) [0x00000] in :0
at Microsoft.Xna.Framework.Game..ctor () [0x00000] in :0 at MonoGameTest.Game1..ctor () [0x00023] in
/Users/sebnabt/Projects/MonoGameTest/MonoGameTest/Game1.cs:38 at
MonoGameTest.Program.Main () [0x00001] in
/Users/sebnabt/Projects/MonoGameTest/MonoGameTest/Program.cs:19
And my code:
<!-- language: lang-cs -->
region Using Statements
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Storage;
using Microsoft.Xna.Framework.Input;
endregion
namespace MonoGameTest
{
/// <summary>
/// This is the main type for your game
/// </summary>
public class Game1 : Game
{
GraphicsDeviceManager graphics;
SpriteBatch spriteBatch;
// Maps user keys to display colors
Dictionary<Keys, Color> key_to_color = new Dictionary<Keys, Color>();
// these are the colors guessed by the user, so far.
List<Color>[] player_colors = new List<Color>[10];
// these are the keys that correspond to a dot color
List<Keys> color_letters = new List<Keys>();
Texture2D dot_picture;
KeyboardState old_keyboard_state;
int row;
public Game1() : base()
{
graphics = new GraphicsDeviceManager(this);
Content.RootDirectory = "Content";
base.Initialize ();
}
/// <summary>
/// Allows the game to perform any initialization it needs to before starting to run.
/// This is where it can query for any required services and load any non-graphic
/// related content. Calling base.Initialize will enumerate through any components
/// and initialize them as well.
/// </summary>
///
/// // screen constants
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
protected override void Initialize()
{
row = 0;
// back buffer
graphics.PreferredBackBufferHeight = SCREEN_HEIGHT;
graphics.PreferredBackBufferWidth = SCREEN_WIDTH;
graphics.PreferMultiSampling = false;
graphics.ApplyChanges();
base.Initialize();
// initialize the color dictionary
key_to_color.Add(Keys.R, Color.Red);
key_to_color.Add(Keys.G, Color.Green);
key_to_color.Add(Keys.B, Color.Blue);
key_to_color.Add(Keys.Y, Color.Yellow);
color_letters = new List<Keys>();
foreach (Keys letter in key_to_color.Keys)
{
color_letters.Add(letter);
}
}
/// <summary>
/// LoadContent will be called once per game and is the place to load
/// all of your content.
/// </summary>
protected override void LoadContent()
{
// Create a new SpriteBatch, which can be used to draw textures.
spriteBatch = new SpriteBatch(GraphicsDevice);
// load our textures
dot_picture = Content.Load<Texture2D>(#"media\ball");
}
/// <summary>
/// Allows the game to run logic such as updating the world,
/// checking for collisions, gathering input, and playing audio.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Update(GameTime gameTime)
{
// get keyboard state once per frame
KeyboardState keyState = Keyboard.GetState();
// exit the game?
if (keyState.IsKeyDown(Keys.Escape))
{
this.Exit();
}
// erase list of player colors?
else if (keyState.IsKeyDown(Keys.Space))
{
player_colors[this.row].Clear();
}
// player pressed a color key?
else {
foreach (Keys letter in color_letters)
{
if (key_was_released(letter, keyState))
{
add_color(letter);
}
if (this.player_colors [row].Count () >= 4) {
this.row = this.row + 1;
}
}
}
old_keyboard_state = keyState;
base.Update(gameTime);
}
protected override void UnloadContent() {
}
bool key_was_released(Keys key, KeyboardState new_state)
{
return old_keyboard_state.IsKeyDown(key) &&
new_state. IsKeyUp (key);
}
void add_color(Keys key)
{
Color color = key_to_color[key];
if (player_colors[this.row].Count() < 4)
{
player_colors[this.row].Add(color);
}
}
/// <summary>
/// This is called when the game should draw itself.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Draw(GameTime gameTime)
{
graphics.GraphicsDevice.Clear (Color.CornflowerBlue);
// draw typical sprites
spriteBatch.Begin ();
draw_player_colors (spriteBatch);
spriteBatch.End ();
base.Draw (gameTime);
}
protected void draw_player_colors(SpriteBatch batch)
{
for (int current_row = 0; current_row < 10; current_row++) {
for (int column = 0; column < player_colors[current_row].Count(); column++) {
int x = 100 + column * 70;
int y = 100 + column * 70;
Vector2 loc = new Vector2 (x, y);
Color c = player_colors[current_row].ElementAt (column);
batch.Draw (dot_picture, loc, c);
}
}
}
}
}
Newest Error:
It looks as though I have gotten it to slightly work however I'm now getting an error in the Basic Template on: logoTexture = Content.Load<Texture2D>("logo");
The error will be below
Microsoft.Xna.Framework.Content.ContentLoadException: Could not load
logo asset as a non- content file! ---> System.Exception: The
directory was not found. ---> System.Exception: Could not find a
part of the path
"/Users/sebnabt/Projects/BSMac/BSMac/bin/Debug/BSMac.app/Contents/Resources/Content/logo.xnb".
at System.IO.FileStream..ctor (System.String path, FileMode mode,
FileAccess access, FileShare share, Int32 bufferSize, Boolean
anonymous, FileOptions options) [0x001c6] in
/private/tmp/source/bockbuild-xamarin/profiles/mono-mac-xamarin-no-pcl/build-root/mono-3.2.0/mcs/class/corlib/System.IO/FileStream.cs:266
at System.IO.FileStream..ctor (System.String path, FileMode mode,
FileAccess access, FileShare share) [0x00000] in
/private/tmp/source/bockbuild-xamarin/profiles/mono-mac-xamarin-no-pcl/build-root/mono-3.2.0/mcs/class/corlib/System.IO/FileStream.cs:132
at at (wrapper remoting-invoke-with-check) System.IO.FileStream:.ctor
(string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare)
at System.IO.File.OpenRead (System.String path) [0x00000] in
/private/tmp/source/bockbuild-xamarin/profiles/mono-mac-xamarin-no-pcl/build-root/mono-3.2.0/mcs/class/corlib/System.IO/File.cs:341
at Microsoft.Xna.Framework.TitleContainer.OpenStream (System.String
name) [0x00000] in :0 at
Microsoft.Xna.Framework.Content.ContentManager.OpenStream
(System.String assetName) [0x00000] in :0 --- End
of inner exception stack trace --- at
Microsoft.Xna.Framework.Content.ContentManager.OpenStream
(System.String assetName) [0x00000] in :0 at
Microsoft.Xna.Framework.Content.ContentManager.ReadAsset[Texture2D]
(System.String assetName, System.Action1 recordDisposableObject)
[0x00000] in <filename unknown>:0 --- End of inner exception stack
trace --- at at
Microsoft.Xna.Framework.Content.ContentManager.ReadAsset<Microsoft.Xna.Framework.Graphics.Texture2D>
(string,System.Action1) <0x0076b> at at
Microsoft.Xna.Framework.Content.ContentManager.Load
(string) <0x0020b> at BSMac.Game1.LoadContent () [0x00023] in
/Users/sebnabt/Projects/BSMac/BSMac/Game1.cs:70 at at
Microsoft.Xna.Framework.Game.Initialize () at
BSMac.Game1.Initialize () [0x00002] in
/Users/sebnabt/Projects/BSMac/BSMac/Game1.cs:57 at at
Microsoft.Xna.Framework.Game.DoInitialize ()
at at Microsoft.Xna.Framework.Game.Run
(Microsoft.Xna.Framework.GameRunBehavior) at
at Microsoft.Xna.Framework.Game.Run () at
BSMac.AppDelegate.FinishedLaunching (MonoMac.Foundation.NSObject)
[0x00012] in /Users/sebnabt/Projects/BSMac/BSMac/Main.cs:34 at at
(wrapper dynamic-method) object.[BSMac.AppDelegate.Void
FinishedLaunching(MonoMac.Foundation.NSObject)]
(MonoMac.Foundation.NSObject,MonoMac.ObjCRuntime.Selector,MonoMac.Foundation.NSObject)
at at (wrapper native-to-managed)
object.[BSMac.AppDelegate.Void
FinishedLaunching(MonoMac.Foundation.NSObject)]
(MonoMac.Foundation.NSObject,MonoMac.ObjCRuntime.Selector,MonoMac.Foundation.NSObject)
at at (wrapper managed-to-native)
MonoMac.AppKit.NSApplication.NSApplicationMain (int,string[])
<0x00003> at at MonoMac.AppKit.NSApplication.Main (string[]) at BSMac.Program.Main (string[]) [0x0001d] in
/Users/sebnabt/Projects/BSMac/BSMac/Main.cs:20 at

Answer 1

Are you building in Xamarin Studio? I believe you are experiencing the same problem described in a question from a couple days ago; see my answer there: https://stackoverflow.com/a/18798311/793449
To recap, Xamarin Studio is picking the WindowsGL framework assembly instead of the mac assembly. You should build MonoGame yourself from the latest source (the MonoGame.Framework.MacOS project) and change the reference out in your game.