Problem Description:
When you perform Check-Out documents from the Document Library where document check-out is required from the SharePoint site in your SharePoint farm, you are getting following error message
“Object reference not set to an instance of an object”
Impact: You are not able to open and edit any office documents
When you will not face the issue: You are not facing the issue on the document library where check-out is not required to edit the documents
Why the problem occurred: Issue started to occur when you installed WSS 3.0 SP2 on you SharePoint server
How you will cross checked: Event Viewer ApplicationàEvent ID 8214
Event Type: Error
Event Source: Windows SharePoint Services 3
Event Category: Topology
Event ID: 8214
Date: 5/12/2009
Time: 3:21:14 PM
User: N/A
Description:
The description for Event ID ( 8214 ) in Source ( Windows SharePoint Services 3 ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: A request was made for a URL, http://novashare, which has not been configured in Alternate Access Mappings. Some links may point to the Alternate Access URL for the default zone, http://spadmin. Review the Alternate Access mappings for this Web application at http://spadmin/_admin/AlternateUrlCollections.aspx and consider adding http://spadmin as a Public Alternate Access URL if it will be used frequently. Help on this error: http://go.microsoft.com/fwlink/?LinkId=114854.
Resolution:
1. Central Administration site
2. Operations
3. Alternate Access Mappings
4. Show AllàChange Alternate Access Mapping Collection
5. Select the Web Application which belongs to the problem site
6. There is a URL that is reflecting in “Default” zone
7. Now specify the URL which is giving you problem in the “Intranet” zone
8. IISRESET
That’s it- Your issue will be resolved and you should be able to check-out and edit the office documents
