Connection Error: System.Exception NET: Unknown error 1 (4325167)

 Can't connect to Orcale DB.  Getting the following error message:

System.Exception
NET: Unknown error 1
Stack Trace:
at Devart.Data.Oracle.DirectUtils.c(Int32 A_0)
at Devart.Data.Oracle.c2.a(Byte& A_0)
at Devart.Data.Oracle.c2.a(String A_0, Int32 A_1, String A_2, String A_3)
at Devart.Data.Oracle.as.a(ag A_0, Boolean A_1)
at Devart.Data.Oracle.as.a(ag A_0, am A_1)
at Devart.Data.Oracle.OracleInternalConnection..ctor(ag
connectionOptions, OracleInternalConnection proxyConnection)
at Devart.Data.Oracle.df.a(i A_0, Object A_1, DbConnectionBase A_2)
at Devart.Common.DbConnectionFactory.a(DbConnectionBase A_0, i 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()