Thanks for the quick response. I have deleted all the files from the UserDefinedTable folder (should I delete the folder as well?), and installed Form and List again, but am still getting the same error.
I should mention that there does not seem to be a Form and List folder in the Desktop Modules folder?
I think the error is the same -
Error: is currently unavailable. DotNetNuke.Services.Exceptions.ModuleLoadException: C:\Inetpub\vhosts\birdline.org.uk\httpdocs\DesktopModules\UserDefinedTable\configuration.ascx(46): error BC30561: 'DataType' is ambiguous, imported from the namespaces or types 'System.ComponentModel.DataAnnotations, DotNetNuke.Modules.UserDefinedTable'. ---> System.Web.HttpCompileException: C:\Inetpub\vhosts\birdline.org.uk\httpdocs\DesktopModules\UserDefinedTable\configuration.ascx(46): error BC30561: 'DataType' is ambiguous, imported from the namespaces or types 'System.ComponentModel.DataAnnotations, DotNetNuke.Modules.UserDefinedTable'. at System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath) at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate) at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate) at System.Web.Compilation.BuildManager.GetVPathBuildResult(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean ensureIsUpToDate) at System.Web.UI.TemplateControl.LoadControl(VirtualPath virtualPath) at DotNetNuke.UI.ControlUtilities.LoadControl[T](TemplateControl containerControl, String ControlSrc) at DotNetNuke.UI.Modules.WebFormsModuleControlFactory.CreateModuleControl(TemplateControl containerControl, ModuleInfo moduleConfiguration) at DotNetNuke.UI.Modules.ModuleControlFactory.LoadModuleControl(TemplateControl containerControl, ModuleInfo moduleConfiguration) at DotNetNuke.UI.Modules.ModuleHost.LoadModuleControl() --- End of inner exception stack trace ---