Runtime error when saving event calendar group part

After editing or creating an event from the event calendar group part we receive the following runtime error when saving the event:

[FormatException: Input string was not in a correct format.]
   Microsoft.VisualBasic.CompilerServices.Conversions.ParseDouble(String Value, NumberFormatInfo NumberFormat) +204
   Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(String Value) +66

[InvalidCastException: Conversion from string "" to type 'Integer' is not valid.]
   Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(String Value) +246
   Blackbaud.Web.Content.Portal.CalendarEvent.SetupAthleticFieldsForGroup() +94
   Blackbaud.Web.Content.Portal.CalendarEvent.Save(Boolean bPreview) +160
   Blackbaud.Web.Content.Portal.CalendarEvent.ButtonSave_Click(Object sender, EventArgs e) +15
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +118
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +112
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +176
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5563
This is resolved in the latest version of NetCommunity. If this behavior is persistent, please confirm you’re on the latest version of NetCommunity.

You will need to edit and save the feeder calendars for the Event Calendar Group part after upgrading.
1. Navigate to the Parts Gallery
2. Search for your Event Calendar parts that are being used by the affected Event Calendar Group part.
3. Select the pencil to edit the part
4. Without making changes, select Save on the each event calendar part.
5. After Saving the feeder calendars, navigate back to the Event Calendar Group part to select the event calendar to add the new event to.

If the dropdowns for the calendar selection does not appear, Click Chat with Support and reference this article

Environment

 6.45.2034 Patch 3
 6.45.2034, patch 27

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