Hi to one and all,

      i downloaded dotnetnuke open source .in my computer i have vs2008.while running it showing error like windows authentication error and object ref

pls can any one help me.pls tell the step to run the dnnsource.

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

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

Source Error:

Line 179: If ObjectProviderName = "" Then Line 180: ' get the typename of the default Provider from web.config Line 181: TypeName = CType(objProviderConfiguration.Providers(objProviderConfiguration.DefaultProvider), Provider).Type Line 182: Else Line 183: ' get the typename of the specified ProviderName from web.config Line 179:                    If ObjectProviderName = "" Then Line 180:                        ' get the typename of the default Provider from web.config Line 181:                        TypeName = CType(objProviderConfiguration.Providers(objProviderConfiguration.DefaultProvider), Provider).Type Line 182:                    Else Line 183:                        ' get the typename of the specified ProviderName from web.config

Source File: E:\DotNetNukeSource\Library\Components\Framework\Reflection.vb    Line: 181