RUN-TIME ERROR '3146'

[OraMs]

In attempting to open an ODBC connection from Access 97 to Oracle databases, I get the above error. This occurs during an OPENCONNECTION and an OPENDATABASE. Below is the code I'm using:

Function AddRows()
    ' Declare Variables
    Dim wrkODBC As Workspace
    Dim dbConn1 As Connection
    Dim dbConn2 As Connection
    
    ' direct to error handler
    On Error GoTo Error_handler

    ' Create an ODBCDirect workspace. Until you create
    ' Microsoft Jet workspace, the Microsoft Jet database
    ' engine will not be loaded into memory.
    
    Set wrkODBC = CreateWorkspace("ODBCWorkspace", "admin", _
        "", dbUseODBC)
        
    'set connection to DB1 in read/write mode
    Set dbConn1 = wrkODBC.OpenConnection("Conn1", , , _
        "ODBC;DATABASE=DB1;UID=username;PWD=password;DSN=DB1DSN")
         
    'set connection to DB2 in read only mode
    Set dbConn2 = wrkODBC.OpenConnection("Conn2", , True, _
        "ODBC;DATABASE=DB2;UID=username;PWD=password;DSN=DB2DSN")
        
    wrkODBC.Close
    
    Exit Function
    
Error_handler:

    Err.Raise Err.Number
    
End Function

TIA