Power Query Syntax

That particular error doesn't make sense to me. The only issue I see at first glance is that you have

CreatedDate = InputRow(InputCreateddatePosition)

instead of

CreatedDate = InputRow(InputCreatedDatePosition)

I don't get any errors with this code:

let
  //Entrée des paramètres fournis pour invoquer la fonction
  photoResult = (InputTable as table, InputBinaryPosition as number, InputNamePosition as number, InputCreatedDatePosition as number) as table =>
    let
      //Obtention des Listes d'images de la base de données
      Source = (InputTable),
      //Conversion de la table qui contient les images en liste
      ListToInput = Table.ToRows(Source),
      //Création de la fonction splitter
      SplitTextFunction = Splitter.SplitTextByRepeatedLengths(30000),
      //Conversion du contenu binaire en text et création d'images entrecoupées en 30000 lignes
      ConvertOneFile = (InputRow as list) =>
        let
          Binary      = InputRow(InputBinaryPosition),
          Name        = InputRow(InputNamePosition),
          CreatedDate = InputRow(InputCreatedDatePosition),
          BinaryText  = Binary.ToText(Binary, BinaryEncoding.Base64),
          SplitUpText = SplitTextFunction(BinaryText),
          AddFileName = List.Transform(SplitUpText, each {Name, CreatedDate, _})
        in
          AddFileName,
      //Passage en revue de toutes les photos et appel de la fonction ci-haute
      ConvertsAllRows = List.Transform(ListToInput, each ConvertOneFile(_)),
      //Combinaison des listes ensemble
      CombineLists = List.Combine(ConvertsAllRows),
      //Conversion du résultat en table
      ToTable = #table(type table [Name = text, CreatedDate = date, PhotoNonConformité = text], CombineLists),
      //Ajout de la colonne index à la table obtenue
      AddIndexColumn = Table.AddIndexColumn(ToTable, "Index", 0, 1)
    in
      AddIndexColumn
in
  photoResult