Sharepoint 2010 Unexpected error

[Dukey]

Hi guys another Sharepoint problem, this one doesnt help me out at all. I get the Sharepoint has encountered an unexpected error. So i went and edited the web.config file and changed custom errors to Off and callstack to true so i could see what the error actually was and i get this:

 

[NullReferenceException: Object reference not set to an instance of an object.]

Microsoft.SharePoint.WebControls.DateTimeField.GetDateValue(DateTimeField fieldControl) +128

Microsoft.SharePoint.WebControls.DateTimeField.Validate(Boolean validateMemberControl) +474

Microsoft.SharePoint.WebControls.DateTimeField.Validate() +44

System.Web.UI.Page.Validate() +117

System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +105

System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +29

System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2981

 

This is comming up when anyone even administrator try to edit a calendar entry in sharepoint or add one. Although the wiered thing is, that this doesnt happen for all calendar entrys just ones on certain dates. Any ideas guys? I've been working on this problem for about 3 days along side my other sharepoint problem which i just sorted about 15 mins ago so im in a better mood

 

Anyway if you could shine any light on this it would be greatly appreciated, obviously you will be thanked for any reply you give even if it didnt work

 

Thanks in advance,

 

Dukey.