How did I wind up here: "Exception.InnerException for details. The error is: Conversion from string "B" to type 'Boolean"

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VB

Visual-Studio

VS2010

Having been working on a program for weeks and it working perfectly I was just about to hand it over when I suddenly got this mystifying message when I haven't touch the program for days:

An error occurred creating the form. See Exception.InnerException for details. The error is: Conversion from string "B" to type 'Boolean' is not valid.

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.Nirro.fmMaintain
        End Sub
    End Class
End Namespace

I turned off the "Just me" option in debugging to get this far but can't get any further.
The high lighted part seems to be where the problem is, but that's of no help to me.
I'm getting this error just loading the form up!!
There's no code in the "Public Class fmMaintain" section ( I removed it )

It stops on the "Me.MainForm = Global.Nirro.fmMaintain" part

Help please!!