Application Error Handler Failed

The application Error Handler failed with an exception.

System.InvalidOperationException: Unable add log entry into table aspnet_ApplicationWebLog. A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
   at Westwind.Utilities.Logging.SqlLogAdapter.WriteEntry(WebLogEntry entry)
   at Drumis.ECommerce.Website.Global.Application_Error(Object sender, EventArgs e)