Function Supabase API - Custon Action

I'm trying to run a function in Supabase with the following code, but without success:

// Automatic FlutterFlow imports
import '/backend/schema/structs/index.dart';
import '/backend/supabase/supabase.dart';
import '/flutter_flow/flutter_flow_theme.dart';
import '/flutter_flow/flutter_flow_util.dart';
import '/custom_code/actions/index.dart'; // Imports other custom actions
import '/flutter_flow/custom_functions.dart'; // Imports custom functions
import 'package:flutter/material.dart';
// Begin custom action code
// DO NOT REMOVE OR MODIFY THE CODE ABOVE!

import 'dart:convert';

import 'package:supabase/supabase.dart';

//String api_url = (FFAppState().supabaseApiURL).replaceAll(' ', '');
//String api_anon = (FFAppState().supabaseApiAnon).replaceAll(' ', '');
//api_url = api_url.trim();

Future<UsersRow?> consultarUser2(String? userId) async {
  final supabase =
      SupabaseClient(FFAppState().supabaseApiURL, FFAppState().supabaseApiAnon);
  //SupabaseClient.instance;
  final response = await supabase.rpc('getuserbyid', params: {'_id': userId});

  if (response.error != null) {
    // Handle error
    print(response.error!.message);
    //return {};
  }

  return UsersRow(response.data!);
}


Any suggestion?