I have a problem Modding

I’m at a friends house using his diamond account to mod my Xbox 360 forza horizon game. But whenever i click mod it gives me a messenge that says (Unhandled expception has occurred in your aplication. If you click Continue, the aplication will ignore this error and attempt to continue. If you click Quit, the application will close immediatly. The givin key was not present in the dictionary) Its getting very anoying anybody have the sulution.

Hi, can you copy and paste the entire contents of the message? Hit the more details button to get all of it. Thank you

Sure here

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
at System.ThrowHelper.ThrowKeyNotFoundException()
at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
at ns0.EditorControl.get_Class67_0()
at ns0.EditorControl.Horizon()
at ns0.EditorControl.Horizon(Int32 int_1)
at ns0.Class261.Horizon(Int32 int_0)
at ns0.Class261.Horizon(Object sender, EventArgs e)
at ns0.Class279.Horizon(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at DevComponents.DotNetBar.ButtonX.OnClick(EventArgs e)
at DevComponents.DotNetBar.ButtonX.OnMouseUp(MouseEventArgs e)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at DevComponents.DotNetBar.PopupItemControl.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

************** Loaded Assemblies **************
mscorlib
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.8670 (QFE.050727-8600)
CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll

Horizon
Assembly Version: 2.7.6.3
Win32 Version: 2.7.6.3
CodeBase: file:///C:/Users/Kira/Desktop/Epicness%20In%20A%207Zip/Horizon%20DIAMOND/Horizon.exe

System
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.8670 (QFE.050727-8600)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll

DevComponents.DotNetBar2
Assembly Version: 8.9.0.5
Win32 Version: 8.9.0.5
CodeBase: file:///C:/Users/Kira/Desktop/Epicness%20In%20A%207Zip/Horizon%20DIAMOND/DevComponents.DotNetBar2.DLL

System.Windows.Forms
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.8670 (QFE.050727-8600)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll

System.Drawing
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.8670 (QFE.050727-8600)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll

Ionic.Zlib.CF
Assembly Version: 1.9.1.5
Win32 Version: 1.9.1.5
CodeBase: file:///C:/Users/Kira/Desktop/Epicness%20In%20A%207Zip/Horizon%20DIAMOND/Ionic.Zlib.CF.DLL

ICSharpCode.SharpZipLib
Assembly Version: 0.86.0.518
Win32 Version: 0.86.0.518
CodeBase: file:///C:/Users/Kira/Desktop/Epicness%20In%20A%207Zip/Horizon%20DIAMOND/ICSharpCode.SharpZipLib.DLL

System.Data.SQLite
Assembly Version: 1.0.65.0
Win32 Version: 1.0.65.0
CodeBase: file:///C:/Users/Kira/Desktop/Epicness%20In%20A%207Zip/Horizon%20DIAMOND/System.Data.SQLite.DLL

System.Data
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.8670 (QFE.050727-8600)
CodeBase: file:///C:/WINDOWS/assembly/GAC_32/System.Data/2.0.0.0__b77a5c561934e089/System.Data.dll

System.Management
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.8670 (QFE.050727-8600)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Management/2.0.0.0__b03f5f7f11d50a3a/System.Management.dll

System.Configuration
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.8670 (QFE.050727-8600)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Configuration/2.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll

System.Core
Assembly Version: 3.5.0.0
Win32 Version: 3.5.30729.8693 built by: QFE
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Core/3.5.0.0__b77a5c561934e089/System.Core.dll

System.Xml
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.8670 (QFE.050727-8600)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll

Accessibility
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.8670 (QFE.050727-8600)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/Accessibility/2.0.0.0__b03f5f7f11d50a3a/Accessibility.dll

dwjuo3sx
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.8670 (QFE.050727-8600)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
<system.windows.forms jitDebugging=“true” />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.

Which tool are you using? Forza Horizon 2 garage editor?

I cant get to that step is the thing. I first select the saved game im going to mod then click mod. Thats when the error message comes up. And sorry i should of been more specific, its forza horizon 1. If you want screen shots of it i can send them.

Is it the livery tool or the regular Forza Horizon profile tool?

Actually, do you have the latest version from the homepage? That stack trace looks like it’s from an older version.

I believe its the regular forza horizon profile tool.

It says we do.

Uninstall the version of Horizon you have, then install this: