When we add a field, and we want the type to me List, and click next, it goes back to the profile list, and hase this error message " A critical error has occurred.
Object reference not set to an instance of an object. "  is there any particular reason why?

Well I went to admin link, then user accounts, then clicked on Manage profile properties, add new profile property, Filled in Property namr, Data type = List , cat = random, lenght = 4, default value is blan, validation expression is blank , required is not check, visible is checked, view order is 1, I clicked next, and it took me back to user accounts table with this error "A critical error has occurred.
Object reference not set to an instance of an object." the event viewer log had this info on it:

AssemblyVersion: 04.06.02
PortalID: 0
PortalName: Hott Recruiters
UserID: 1
UserName: host
ActiveTabID: 42
ActiveTabName: User Accounts
RawURL: /Admin/UserAccounts/tabid/42/ctl/EditProfileProperty/mid/359/Default.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www.hottrecruiters.com/Admin/UserAccounts/tabid/42/ctl/EditProfileProperty/mid/359/Default.aspx
UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; InfoPath.1)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: e7aa237b-b977-43ed-a872-4d3843434ea6
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.Common.Lists.ListEntries.BindGrid
StackTrace:
Message: DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Common.Lists.ListEntries.BindGrid() at DotNetNuke.Common.Lists.ListEntries.DataBind() at DotNetNuke.Modules.Admin.Users.EditProfileDefinition.BindList() at DotNetNuke.Modules.Admin.Users.EditProfileDefinition.Wizard_ActiveStepChanged(Object sender, EventArgs e) at System.Web.UI.WebControls.Wizard.OnActiveStepChanged(Object source, EventArgs e) at System.Web.UI.WebControls.Wizard.MultiViewActiveViewChanged(Object source, EventArgs e) at System.Web.UI.WebControls.MultiView.OnActiveViewChanged(EventArgs e) at System.Web.UI.WebControls.MultiView.set_ActiveViewIndex(Int32 value) at System.Web.UI.WebControls.Wizard.set_ActiveStepIndex(Int32 value) at System.Web.UI.WebControls.Wizard.OnBubbleEvent(Object source, EventArgs e) at System.Web.UI.WebControls.Wizard.WizardChildTable.OnBubbleEvent(Object source, EventArgs args) at System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) at System.Web.UI.WebControls.LinkButton.OnCommand(CommandEventArgs e) at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---
Source:
Server Name: IHOSTLLC20

I, too, am having this same problem. Same sequence with the manage profile properties, add a property, choose list (doesn't matter what I name it), and next craps out with a critical error. The event log has the following. I can other types of properties beside list. What is preventing me from adding a list properly?

AssemblyVersion: 04.06.02
PortalID: 0
PortalName: Think Computer Consulting
UserID: 2
UserName: admin
ActiveTabID: 42
ActiveTabName: User Accounts
RawURL: /Admin/UserAccounts/tabid/42/ctl/EditProfileProperty/mid/358/Default.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www.think.ca/Admin/UserAccounts/tabid/42/ctl/EditProfileProperty/mid/358/Default.aspx
UserAgent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 188210a2-5010-49aa-a195-7a62b4eb1d0b
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.Common.Lists.ListEntries.BindGrid
StackTrace:
Message: DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Common.Lists.ListEntries.BindGrid() at DotNetNuke.Common.Lists.ListEntries.DataBind() at DotNetNuke.Modules.Admin.Users.EditProfileDefinition.BindList() at DotNetNuke.Modules.Admin.Users.EditProfileDefinition.Wizard_ActiveStepChanged(Object sender, EventArgs e) at System.Web.UI.WebControls.Wizard.OnActiveStepChanged(Object source, EventArgs e) at System.Web.UI.WebControls.Wizard.MultiViewActiveViewChanged(Object source, EventArgs e) at System.Web.UI.WebControls.MultiView.OnActiveViewChanged(EventArgs e) at System.Web.UI.WebControls.MultiView.set_ActiveViewIndex(Int32 value) at System.Web.UI.WebControls.Wizard.set_ActiveStepIndex(Int32 value) at System.Web.UI.WebControls.Wizard.OnBubbleEvent(Object source, EventArgs e) at System.Web.UI.WebControls.Wizard.WizardChildTable.OnBubbleEvent(Object source, EventArgs args) at System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) at System.Web.UI.WebControls.LinkButton.OnCommand(CommandEventArgs e) at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---
Source:
Server Name: WSS33