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System.IO.FileNotFoundException error while connection using toad data point 3.7 , 3.6 … , I have oracle version of 11.2.0 g

Please help, I am not able to connect oracle data base using toad data point 3.7 , 3.6 … , I have oracle version of 11.2.0 g

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System.IO.FileNotFoundException

Can not load Oracle client library oci.dll from home OraClient11g_home1.

Stack Trace:

at Devart.Data.Oracle.OracleHome.get_ClientVersion()

at Devart.Data.Oracle.OracleHome.a()

at Devart.Data.Oracle.a7.i()

at Devart.Data.Oracle.a7.a(Boolean A_0, Boolean A_1, OracleHome A_2, Boolean A_3, Boolean A_4)

at Devart.Data.Oracle.OracleInternalConnection…ctor(ce connectionOptions, OracleInternalConnection proxyConnection)

at Devart.Data.Oracle.au.a(r A_0, Object A_1, DbConnectionBase A_2)

at Devart.Common.DbConnectionFactory.a(DbConnectionBase A_0, r A_1)

at Devart.Common.DbConnectionFactory.b(DbConnectionBase A_0)

at Devart.Common.DbConnectionClosed.Open(DbConnectionBase outerConnection)

at Devart.Common.DbConnectionBase.Open()

at Devart.Data.Oracle.OracleConnection.Open()

at Quest.Toad.Db.Connection.OpenConnection(IDbConnection connection)

at Quest.Toad.Oracle.OracleToadConnection.OpenConnection(IDbConnection connection)

at Quest.Toad.Db.Connection.AllocConnection()

at Quest.Toad.Db.Connection.Connect(Boolean notify)

at Quest.Toad.Db.Provider.BackgroundConnector.CreateBackgroundConnection()

Your Oracle client is corrupted. Please reinstall it.

Aleksey