DNN: 4.5.0
Events calendar: 3.3.7

Hi, after I upgrade my calendar to the latest version... this error msg kept popping up whenever I mouseover the actions button at the top right.

Error message: 400 - Object reference not set to an instance of an object.

Anybody facing the same problem and anyone can advise what causes it?

Thank you for looking into this problem. Below is the error msg from DNN Logs.

ModuleId: -1
ModuleDefId: -1
FriendlyName:
ModuleControlSource:
AssemblyVersion: 04.05.00
PortalID: 0
PortalName: My Website
UserID: 2
UserName: admin
ActiveTabID: 74
ActiveTabName: Events
RawURL: /dotnetnuke/Events/tabid/74/Default.aspx
AbsoluteURL: /dotnetnuke/Default.aspx
AbsoluteURLReferrer: http://XXX/dotnetnuke/Events/tabid/74/ctl/Module/ModuleId/407/Default.aspx
UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: d1a83f84-8c8f-4b8c-bfe5-2cb6af4f2e85
InnerException: Unhandled error loading module.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.Web.UI.TemplateParser.ProcessError
StackTrace:
Message: DotNetNuke.Services.Exceptions.ModuleLoadException: Unhandled error loading module. ---> System.Web.HttpParseException: Unknown server tag 'dnn:ACTIONBUTTON5'. ---> System.Exception: Unknown server tag 'dnn:ACTIONBUTTON5'. ---> System.Web.HttpException: Unknown server tag 'dnn:ACTIONBUTTON5'. at System.Web.UI.TemplateParser.ProcessError(String message) at System.Web.UI.TemplateParser.ProcessBeginTag(Match match, String inputText) 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) --- End of inner exception stack trace --- at System.Web.UI.TemplateParser.ParseString(String text, VirtualPath virtualPath, Encoding fileEncoding) 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.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.UI.TemplateControl.LoadControl(VirtualPath virtualPath) at System.Web.UI.TemplateControl.LoadControl(String virtualPath) at DotNetNuke.UI.Skins.Skin.LoadContainer(String ContainerPath, Control objPane) --- End of inner exception stack trace ---
Source:
Server Name: XXX