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Object reference not set to an instance of an object


This message appears if a user tries to check out a file from a library.

Possible solution

  1. Check the log on the Microsoft® SharePoint® server for a message that looks similar to the following: "Warning: Alternate access mappings have not been configured. Users or services are accessing the site http://eps01shrpnt-02 with the URL This may cause incorrect links to be stored or returned to users. If this is expected, add the URL as an AAM response URL. For more information, see:".
  2. Add the URL that the user is trying to access to the Alternate Access Mapping Collection on the Microsoft SharePoint server. For more information, visit

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