Error: Object reference not set to an instance of an object

After updating to 3.5.1 I received this error on all sites, no content, just the skin show.

I can login and edit content, however once I update/save it will not show anything.  All of the sites show the skin but no content or containers, nothing. 

Example site: www.bodylinemedispa.com

Any suggestions as to what I can do to fix this error?

Jeff

 Hi Chris, Thanks for your reply.  Log info below:

AssemblyVersion: 5.3.1
PortalID: 0
PortalName: Wild Pony Hosting
UserID: 40
UserName: host
ActiveTabID: 49
ActiveTabName: Log Viewer
RawURL: /Admin/LogViewer/tabid/49/Default.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www.wildpony.net/Default.aspx
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/532.5 (KHTML, like Gecko) Chrome/4.1.249.1045 Safari/532.5
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 95459849-fd89-4d9b-97cc-facd88e1d82e
InnerException: Unhandled error loading page.
FileName: 
FileLineNumber: 0
FileColumnNumber: 0
Method: System.Web.Compilation.BuildManager.PostProcessFoundBuildResult
StackTrace: 
Message: DotNetNuke.Services.Exceptions.PageLoadException: Unhandled error loading page. ---> System.Web.HttpParseException: C:\Inetpub\vhosts\wildpony.net\httpdocs\dnn\Desktopmodules\CAT_Search\Search.ascx.vb(45): error BC30002: Type 'C_DropDownListControl' is not defined. ---> System.Web.HttpCompileException: C:\Inetpub\vhosts\wildpony.net\httpdocs\dnn\Desktopmodules\CAT_Search\Search.ascx.vb(45): error BC30002: Type 'C_DropDownListControl' is not defined. at System.Web.Compilation.BuildManager.PostProcessFoundBuildResult(BuildResult result, Boolean keyFromVPP, VirtualPath virtualPath) at System.Web.Compilation.BuildManager.GetBuildResultFromCacheInternal(String cacheKey, Boolean keyFromVPP, VirtualPath virtualPath, Int64 hashCode) at System.Web.Compilation.BuildManager.GetVPathBuildResultFromCacheInternal(VirtualPath virtualPath) at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.Compilation.BuildManager.GetVPathBuildResult(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.UI.BaseTemplateParser.GetReferencedType(VirtualPath virtualPath, Boolean allowNoCompile) at System.Web.UI.BaseTemplateParser.GetUserControlType(VirtualPath virtualPath) at System.Web.UI.MainTagNameToTypeMapper.ProcessUserControlRegistration(UserControlRegisterEntry ucRegisterEntry) at System.Web.UI.BaseTemplateParser.ProcessDirective(String directiveName, IDictionary directive) at System.Web.UI.TemplateControlParser.ProcessDirective(String directiveName, IDictionary directive) at System.Web.UI.TemplateParser.ParseStringInternal(String text, Encoding fileEncoding) --- End of inner exception stack trace --- at System.Web.UI.TemplateParser.ProcessException(Exception ex) at System.Web.UI.TemplateParser.ParseStringInternal(String text, Encoding fileEncoding) at System.Web.UI.TemplateParser.ParseString(String text, VirtualPath virtualPath, Encoding fileEncoding) at System.Web.UI.TemplateParser.ParseReader(StreamReader reader, VirtualPath virtualPath) at System.Web.UI.TemplateParser.ParseFile(String physicalPath, VirtualPath virtualPath) at System.Web.UI.TemplateParser.ParseInternal() at System.Web.UI.TemplateParser.Parse() at System.Web.UI.TemplateParser.Parse(ICollection referencedAssemblies, VirtualPath virtualPath) at System.Web.Compilation.BaseTemplateBuildProvider.get_CodeCompilerType() at System.Web.Compilation.BuildProvider.GetCompilerTypeFromBuildProvider(BuildProvider buildProvider) at System.Web.Compilation.BuildProvidersCompiler.ProcessBuildProviders() at System.Web.Compilation.BuildProvidersCompiler.PerformBuild() at System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath) at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.Compilation.BuildManager.GetVPathBuildResult(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.UI.TemplateControl.LoadControl(VirtualPath virtualPath) at System.Web.UI.TemplateControl.LoadControl(String virtualPath) at DotNetNuke.UI.ControlUtilities.LoadControl[T](TemplateControl containerControl, String ControlSrc) at DotNetNuke.UI.Skins.Skin.LoadSkin(PageBase Page, String SkinPath) --- End of inner exception stack trace ---
Source: 
Server Name: NET

 I uninstalled Catalook completely from that instance, restarted instance and the error is still there?  What do you recommend I do next?