vb.net-2010 – OnCreateMainForm()Sub中的Application.Designer

System.InvalidOperationException was unhandled Message=An error
occurred creating the form. See Exception.InnerException for details.
The error is: Object reference not set to an instance of an object.

我不明白为什么在自动生成的文件中发生此错误.以下是完整的代码：

'------------------------------------------------------------------------------
' <auto-generated>
'     This code was generated by a tool.
'     Runtime Version:4.0.30319.269
'
'     Changes to this file may cause incorrect behavior and will be lost if
'     the code is regenerated.
' </auto-generated>
'------------------------------------------------------------------------------

Option Strict On
Option Explicit On


Namespace My

    'NOTE: This file is auto-generated; do not modify it directly.  To make changes,' or if you encounter build errors in this file,go to the Project Designer
    ' (go to Project Properties or double-click the My Project node in
    ' Solution Explorer),and make changes on the Application tab.
    '
    Partial Friend Class MyApplication

        <Global.System.Diagnostics.DebuggerStepThroughAttribute()>  _
        Public Sub New()
            MyBase.New(Global.Microsoft.VisualBasic.ApplicationServices.AuthenticationMode.Windows)
            Me.IsSingleInstance = false
            Me.EnableVisualStyles = true
            Me.SaveMySettingsOnExit = true
            Me.ShutDownStyle = Global.Microsoft.VisualBasic.ApplicationServices.ShutdownMode.AfterMainFormCloses
        End Sub

        <Global.System.Diagnostics.DebuggerStepThroughAttribute()>  _
        Protected Overrides Sub OnCreateMainForm()
            Me.MainForm = Global.AccountAndClientFull.frmMain 'HERE IS WHERE THE ERROR OCCURS
        End Sub
    End Class
End Namespace

错误发生在：

Me.MainForm = Global.AccountAndClientFull.frmMain

有什么建议？我无法弄清楚需要在项目属性的应用程序选项卡中进行哪些更改.