# System.NullReferenceException. Object reference not set to an instance of an object

**URL:** <https://forums.toadworld.com/t/system-nullreferenceexception-object-reference-not-set-to-an-instance-of-an-object/31696>\
**Category:** Toad for IBM DB2\
**Created:** [November 11, 2014, 6:29pm UTC](https://forums.toadworld.com/t/system-nullreferenceexception-object-reference-not-set-to-an-instance-of-an-object/31696 "2014-11-11T18:29:48Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![wyduan](https://avatars.discourse-cdn.com/v4/letter/w/58f4c7/32.png) [@wyduan](https://forums.toadworld.com/u/wyduan)\
**Post date:** [November 11, 2014, 6:29pm UTC](https://forums.toadworld.com/t/system-nullreferenceexception-object-reference-not-set-to-an-instance-of-an-object/31696/1 "2014-11-11T18:29:48Z")

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Remarks，DB2 version is v10.5.0.3 ，the operating system is linux ia64。

When I used the toad 5.6 for DB2 LUW to connect the remote database,then the following error was jumping :

System.NullReferenceException  
Object reference not set to an instance of an object.  
Stack Trace:  
at IBM.Data.DB2.DB2ConnPool.Open(DB2Connection connection, String& szConnectionString, DB2ConnSettings& ppSettings, Object& ppConn)  
at IBM.Data.DB2.DB2Connection.Open()  
at Quest.Toad.Db.Connection.OpenConnection(IDbConnection connection)  
at Quest.Toad.DB2.DB2ToadConnection.OpenConnection(IDbConnection connection)  
at Quest.Toad.Db.Connection.AllocConnection()  
at Quest.Toad.Db.Connection.Connect(Boolean notify)  
at Quest.Toad.Db.Provider.BackgroundConnector.CreateBackgroundConnection()