[Microsoft][ODBC dBase Driver]Invalid precision value

Hello everyone,
I have a dbase database that I am trying to query for a login to a website. I am using ASP with IIS. When I try to query the database to match the logins I get en error:

Microsoft OLE DB Provider for ODBC Drivers error '80040e21'

[Microsoft][ODBC dBase Driver]Invalid precision value



I am using the following code:

<%
' *** Validate request to log in to this site.
MM_LoginAction = Request.ServerVariables("URL")

If Request.QueryString <> "" Then MM_LoginAction = MM_LoginAction + "?" + Server.HTMLEncode(Request.QueryString)
MM_valUsername = CStr(Request.Form("kt_login_user"))
If MM_valUsername <> "" Then
  Dim MM_fldUserAuthorization
  Dim MM_redirectLoginSuccess
  Dim MM_redirectLoginFailed
  Dim MM_loginSQL
  Dim MM_rsUser
  Dim MM_rsUser_cmd
 
  MM_fldUserAuthorization = ""
  MM_redirectLoginSuccess = "intra.asp"
  MM_redirectLoginFailed = "login1.asp"
  Session("URL_His") = ""
 
  Login_User = MM_valUsername
  Login_Pass = Request.Form("kt_login_password")


 
  MM_LoginSQL = "SELECT CUSTMAIL.DIRCODE, CUSTMAIL.EMAIL, CUSTMAIL.WEBPASS, CUSTOMER.SREP_CODE, CUSTMAIL.ORDERENTRY, CUSTMAIL.DEFAULT_E, CUSTOMER.COMPANY FROM CUSTMAIL INNER JOIN CUSTOMER ON CUSTMAIL.DIRCODE = CUSTOMER.DIRCODE WHERE (((CUSTMAIL.DIRCODE) Between '7A' And '7Z'))) AND CUSTMAIL.EMAIL = ? AND CUSTMAIL.WEBPASS = ?"



If MM_fldUserAuthorization <> "" Then MM_loginSQL = MM_loginSQL & "," & MM_fldUserAuthorization

 
  Set MM_rsUser_cmd = Server.CreateObject ("ADODB.Command")
  MM_rsUser_cmd.ActiveConnection = MM_CellSell_STRING
  Response.Write("SQL:&nbsp;" & MM_loginSQL & "<br/>")
 
 
  MM_rsUser_cmd.CommandText = MM_loginSQL
  MM_rsUser_cmd.Parameters.Append MM_rsUser_cmd.CreateParameter("param1", 200, 1, 255, MM_valUsername) ' adVarChar
  MM_rsUser_cmd.Parameters.Append MM_rsUser_cmd.CreateParameter("param2", 200, 1, 255, Request.Form("kt_login_password")) ' adVarChar
  MM_rsUser_cmd.Prepared = true
  Set MM_rsUser = MM_rsUser_cmd.Execute

  If Not MM_rsUser.EOF Or Not MM_rsUser.BOF Then
    ' username and password match - this is a valid user
    Session("MM_Username") = MM_valUsername
    If (MM_fldUserAuthorization <> "") Then
      Session("MM_UserAuthorization") = CStr(MM_rsUser.Fields.Item(MM_fldUserAuthorization).Value)
    Else
      Session("MM_UserAuthorization") = ""
    End If
    if CStr(Request.QueryString("accessdenied")) <> "" And true Then
      
      Session("URL_His") = Request.QueryString("accessdenied")
      MM_redirectLoginSuccess = "intra.asp"
    End If
    MM_rsUser.Close
    Response.Redirect(MM_redirectLoginSuccess)
  End If
  MM_rsUser.Close
  Response.Redirect(MM_redirectLoginFailed)
End If
%>