[RESOLVED] An error occurred creating the form

This has happened on the last 3 projects i created.

All projects only had a textbox and button with basic code.

If i comment out all code in the form, project runs.


Application.Designer.vb

Code:

---

'------------------------------------------------------------------------------
' <auto-generated>
'    This code was generated by a tool.
'    Runtime Version:4.0.30319.42000
'
'    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.NewClientConsole.Form1 'ERROR HERE
        End Sub
    End Class
End Namespace

---

ERROR
System.InvalidOperationException
HResult=0x80131509
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.
Source=NewClientConsole
StackTrace:
at NewClientConsole.My.MyProject.MyForms.Create__Instance__[T](T Instance) in :line 190
at NewClientConsole.My.MyProject.MyForms.get_Form1()
at NewClientConsole.My.MyApplication.OnCreateMainForm() in C:\Users\mcapp\OneDrive\Documents\Visual Studio 2017\NewClientConsole\NewClientConsole\My Project\Application.Designer.vb:line 35
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
at NewClientConsole.My.MyApplication.Main(String[] Args) in :line 81

Inner Exception 1:
NullReferenceException: Object reference not set to an instance of an object.

opps, had this , sorry

so ClientName was expecting to have a value which looks like its the problem.

Code:

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Public Class Form2
    Dim ClientName As String = TxtName.Text

---

You are almost certainly running in to an issue where TxtName doesn't yet exist when that line of code is being executed.

Change it to:

Code:

---

Dim ClientName As String

---

Then, in the Form_Load event, add:

Code:

---

ClientName = TxtName.Text

---

Quote:

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Originally Posted by OptionBase1

Change it to:

Code:

---

Dim ClientName As String

---

---

Really ought to be:

Code:

---

Private ClientName As String

---

Always better to be explicit about access level.

Quote:

---

Originally Posted by OptionBase1

Then, in the Form_Load event, add:

Code:

---

ClientName = TxtName.Text

---

---

That would accomplish what the original code appears to intend, but is that worthwhile anyway? What's the point in getting the Text from a TextBox that the user hasn't even seen yet, thus could not have populated yet? If that TextBox is populated via a bound setting or the like, then the field should be populated from that setting rather than from the control.