Operation is not allowed when the object is open

Private Sub btnSearch_Click()

Dim objConn As ADODB.Connection
Dim objRST As ADODB.Recordset
Dim strSQL As String
Dim strConn As String
Dim strLicense As String

'Create the ADODB Connection and Recordset objects
Set objConn = CreateObject("ADODB.Connection")
Set objRST = CreateObject("ADODB.Recordset")

'Open the ADODB Connection
strConn = "provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Documents and Settings\USER\Desktop\Images\database.mdb;"
strLicense = InputBox("Please enter the license number", "Enter License Number")
strSQL = "Select * from IndexData WHERE Field2 = '" & strLicense & "';"

objConn.Open (strConn)
objConn.Mode = adModeRead
objRST.Open strSQL, objConn, adOpenForwardOnly, adLockOptimistic
objRST.MoveFirst

'Print relevant provider information
While Not objRST.EOF
    Debug.Print objRST.Fields("Field2")
    Debug.Print objRST.Fields("Field1")
    Debug.Print objRST.Fields("Field3")
    Debug.Print objRST.Fields("DOCID")
    Debug.Print objRST.Fields("DISK")
    Debug.Print objRST.Fields("ImagePath")
    objRST.MoveNext
Wend

objRST.Close
objConn.Close
'Release the variables
Set objRST = Nothing
Set objConn = Nothing

End Sub

OBJCONN.MODE is where the error is occuring at. I am very new to VBA and haven't been in a VB class in over 7 yrs so any help would be greatly appreciated!