System.Data.OleDb.OleDbException' occurred in System.Data.dll
    Query input must contain at least one table or query.

OleDbConnection con = new OleDbConnection(stringcon);
                OleDbCommand cmd = new OleDbCommand();

                cmd.Connection = con;
                cmd.CommandText = "INSERT INTO [clients]([Firstname],[Lastname],[Email],[Phonenumber],[Address],[CNP],[SeriesCI],[NumberCI],[Sex],[CUI],[J],[Personaldescription],[Temperament],[Provenance],[Registerdata],[Idteam]) " +
                    "VALUES(@f,@l,@e,@ph,@add,@cnp,@ser,@n,@sex,@cui,@j,@pd,@te,@prov,@reg,(select team.id from team where team.Email=@email)) ";

                // cmd.CommandText = "INSERT INTO [clients]([Firstname],[Lastname],[Email],[Phonenumber],[Address],[CNP],[SeriesCI],[NumberCI],[Sex],[CUI],[J],[Personaldescription],[Temperament],[Provenance],[Registerdata]) " +
                //"VALUES(@f,@l,@e,@ph,@add,@cnp,@ser,@n,@sex,@cui,@j,@pd,@te,@prov,@reg) ";


                cmd.Parameters.AddWithValue("@f", materialSingleLineTextField16.Text);
                cmd.Parameters.AddWithValue("@l", materialSingleLineTextField15.Text);
                cmd.Parameters.AddWithValue("@e", materialSingleLineTextField14.Text);
                cmd.Parameters.AddWithValue("@ph", materialSingleLineTextField13.Text);
                cmd.Parameters.AddWithValue("@add", materialSingleLineTextField6.Text);
                cmd.Parameters.AddWithValue("@cnp", materialSingleLineTextField1.Text);
                cmd.Parameters.AddWithValue("@ser", materialSingleLineTextField3.Text);
                cmd.Parameters.AddWithValue("@n", materialSingleLineTextField2.Text);
                cmd.Parameters.AddWithValue("@sex", gender);
                cmd.Parameters.AddWithValue("@cui", materialSingleLineTextField4.Text);
                cmd.Parameters.AddWithValue("@j", materialSingleLineTextField5.Text);
                cmd.Parameters.AddWithValue("@pd", richTextBox2.Text);
                cmd.Parameters.AddWithValue("@te", bunifuDropdown1.selectedValue);
                cmd.Parameters.AddWithValue("@prov", bunifuDropdown2.selectedValue);
                cmd.Parameters.AddWithValue("@reg", DateTime.Now.ToString("dd-MM-yyyy HH: mm:ss"));
                cmd.Parameters.AddWithValue("@email", Form1.Email);


                con.Open();

                cmd.ExecuteNonQuery();
                con.Close();