ambiguous overloading

[JulJACQUOT at aol dot com]

   under RB 5.Oa6 OSX:

df=new realdatabase
    dffile=getfolderitem("Salaires")
    dffile.MacType="MACT"
    dffile.MacCreator="Mcte"
    if dffile.exists then
      df.databasefile=dffile
      if df.connect then
        dd=df.SQLSelect("select max(Aidads) from Dads")

   here, this message is displayed :
*Ambiguous overloading for this method call*

please, who can tell me what means this ?

thank's for your help

jules

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