Error in saving the script: null

Error in saving the script: null

When trying to save a script (scheduled) I get the following error: Error in saving the script: null.
My code is as follows:
  1. Entrees_Lexicalisees = Ricci_Droit_Form [Lexique_FR1 != ""];
    for each Entree_Dico in Entrees_Lexicalisees
    {
        Champ_Termes_Fr=Entree_Dico.Lexique_FR1;
        Liste_Termes_Fr=Champ_Termes_Fr.toList();
        Terme_Chinois=Entree_Dico.CHN;
        
        for each Element in Liste_Termes_Fr    
        {
       if (Lexique_Francais [Terme_Francais == Element && Termes_Chinois.contains(Terme_Chinois)])   
        {
        //then do nothing
        }
        else if (Lexique_Francais [Terme_Francais == Element])
            {
            Lexique = Lexique_Francais [Terme_Francais == Element];        
            Termes_MAJ = Lexique.Termes_Chinois.toList();
            Termes_MAJ.Add(Terme_Chinois);
            Lexique.Termes_Chinois = Termes_MAJ.toString();
            Lexique.Date_Modif = zoho.currenttime;
            }
        else
        {
            insert into Lexique_Francais
            [
            Terme_Francais = Element
            Termes_Chinois = Terme_Chinois
            Date_Ajout = zoho.currenttime
            ]

        }

        }
    }
































Has anyone got an idea as to what is wrong?