Setup Error in windowsfroms

Question

i have created one application in windowsfroms with database hosted in server and created the setup for same.

 

After installation ,i tried to open my application and enter the login details and it leads to the following error.........please help me to resolve the error 

 

See the end of this message for details on invoking

just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************

System.NullReferenceException: Object reference not set to an instance of an object.

at nameof project.DAL..ctor()

at name of project.Form1.button1_Click(Object sender, EventArgs e)

at System.Windows.Forms.Control.OnClick(EventArgs e)

at System.Windows.Forms.Button.OnClick(EventArgs e)

at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)

at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)

at System.Windows.Forms.Control.WndProc(Message& m)

at System.Windows.Forms.ButtonBase.WndProc(Message& m)

at System.Windows.Forms.Button.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: 4.0.0.0

Win32 Version: 4.6.1590.0 built by: NETFXREL2

CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll

----------------------------------------

Assembly Version: 1.0.0.0

Win32 Version: 1.0.0.0

CodeBase: file:///C:/Program%20Files%20(x86)/company%20name%20Pvt%20Ltd/My%20Product%20Name/name%20College%20Anc.exe

----------------------------------------

System.Windows.Forms

Assembly Version: 4.0.0.0

Win32 Version: 4.6.1590.0 built by: NETFXREL2

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll

----------------------------------------

System

Assembly Version: 4.0.0.0

Win32 Version: 4.6.1590.0 built by: NETFXREL2

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll

----------------------------------------

System.Drawing

Assembly Version: 4.0.0.0

Win32 Version: 4.6.1590.0 built by: NETFXREL2

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll

----------------------------------------

System.Configuration

Assembly Version: 4.0.0.0

Win32 Version: 4.6.1590.0 built by: NETFXREL2

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll

----------------------------------------

System.Core

Assembly Version: 4.0.0.0

Win32 Version: 4.6.1590.0 built by: NETFXREL2

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll

----------------------------------------

System.Xml

Assembly Version: 4.0.0.0

Win32 Version: 4.6.1590.0 built by: NETFXREL2

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll

----------------------------------------

System.Data

 

Assembly Version: 4.0.0.0

Win32 Version: 4.6.1590.0 built by: NETFXREL2

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_32/System.Data/v4.0_4.0.0.0__b77a5c561934e089/System.Data.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:

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.