NoReverseMatch at - Reverse with arguments '('',)' not found

Hi all,

I need help.

I keep getting this issue, NoReverseMatch at /

Reverse for 'productsgrouping-update' with arguments '('',)' not found. 1 pattern(s) tried: ['update/(?P<url_id>[0-9]+)/$']

not sure what am doing wrong. Any time I put url tag {% url 'productsgrouping-update' lista.id%} in html i get the error.

Both url work as stand alone, /index and /index/update/1/ but when i put url tag all hell break loose.. I strugling for a week now. Thank you all in advance.

<view>

from django.shortcuts import render, redirect

from django.http import HttpResponse

from .models import Material4, MaterialGroup

from django.db import connection

from .forms import ProductgroupinputForm, MaterialGroupForm

from django.conf import settings

def productsView(request):

lista = MaterialGroup.objects.all()

#text5 = MaterialGroup.objects.get(id=url_id)

#return redirect(reverse('productsgrouping_update', kwargs=('id':url_id)))

return render(request, "productsgroup.html", {"lista" : lista})

def productsUpdateView(request, url_id):

text5 = MaterialGroup.objects.get(id=url_id)

form5 = ProductgroupinputForm(request.POST or None, instance=text5)

context1 = {'text5': text5,'form5': form5}

if form5.is_valid():

form5.save()

return render(request, 'productsgroup-update.html', context1)

<url>

from django.urls import path

from . import views

urlpatterns = [

    path('', views.productsView, name='productsgrouping'),

    path('update/<int:url_id>/', views.productsUpdateView, name='productsgrouping-update'),

]

<main url>

from django.contrib import admin

from django.urls import path, include

from django.contrib.staticfiles.urls import staticfiles_urlpatterns

urlpatterns = [

    path('admin/', admin.site.urls),

    path('', include('product.urls')),

]

<model>

from __future__ import unicode_literals

from django.db import models, connection

from django.utils import timezone

from datetime import date

from django.urls import reverse

class Material4(models.Model):

    id = models.IntegerField(db_column='ID', primary_key=True, blank=False, unique=True)

    bukrs = models.CharField(db_column='BUKRS', max_length=3)

    materialid = models.CharField(db_column='MaterialID', max_length=50)

    maktx = models.CharField(db_column='MAKTX', max_length=150)

    input_group = models.IntegerField(db_column='Input_group')

    class Meta:

        managed = False

        db_table = 'Material4'

    def __str__(self):

    return '%s %s %s %s' % (self.id, self.materialid, self.maktx, self.input_group)

<forms>

from django import forms

from .models import Material4, MaterialGroup

class ProductgroupinputForm(forms.ModelForm):

    class Meta:

        model = Material4

        fields = ['materialid', 'input_group', 'id', 'input_group']

class MaterialGroupForm(forms.ModelForm):

    class Meta:

        model = MaterialGroup

        fields = ['material_group', 'id']

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