Hi I am using DNN 5 and get this error in my events calendar Module built by Smart Thinker. How do I fix or update any help would be appreciated as it now won't send emails out when people register when I make a new event for some reason.

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AssemblyVersion: 5.5.1
PortalID: 0
PortalName: Kayak Noosa - Guided Kayak Adventure Tours | Kayak Hire | Kayaking Instruction | Kayaks for Sale
UserID: 1
UserName: host
ActiveTabID: 83
ActiveTabName: Kayak Tour Booking Calendar
RawURL: /KayakTours/KayakTourBookingCalendar/tabid/83/ctl/Edit/mid/409/itemid/47/Default.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www.kayaknoosa.com/kayaktours/tabid/83/vw/3/itemid/47/d/20140315/test.aspx
UserAgent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: fc797603-35f5-442b-af65-048fef0bb5f5
InnerException: Error loading FCK setting (HTML Encode output)
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.Boolean.Parse
StackTrace:
Message: System.Exception: Error loading FCK setting (HTML Encode output) ---> System.FormatException: String was not recognized as a valid Boolean. at System.Boolean.Parse(String value) at DotNetNuke.HtmlEditor.FckHtmlEditorProvider.Fckeditor.LoadFCKCTLSettings(Boolean mAdmin) --- End of inner exception stack trace ---
Source:
Server Name: BLUE

Thanks, I have updated to CKeditor all good

For DNN 8,

You need to modify below code from @Avinash

var editor = $find('dnn_ctr1052_ManageEmailTemplate_txtContent_txtContent');
if (editor)
editor.set_html(tag);


to

var editor = CKEDITOR.instances['dnn_ctr1052_ManageEmailTemplate_txtContent_txtContent'];
if (editor)
editor.setData(tag);