Django submit form problem

could you tell me what"s wrong with my form? Why can"t the data be submitted?

                    <form class="ui form" method="post" action="{% url "users:my_recharge" %}">
                            {% csrf_token %}
                          <div class="left icon field">
                            <label> :</label>
                            <input id="id_amount" type="text" name="amount" placeholder="">
                          </div>
                          <div class="field">
                          <label> :</label>
                            <select name="currency">
                              <option value="jpy"> -JPY</option>
                              <option value="usd">US -USD</option>
                            </select>
                            

0Paypal

</div> {-sharp <input type="text" name="rate" value="17.12" hidden>-sharp} <input type="text" name="admin_pay_type" value="PP" hidden> <input type="text" name="pay_type" value="7" hidden> <input type="checkbox" value="True" name="a_type" hidden> <div class="field"> <!-- <div class="ui checkbox"> <input type="checkbox" tabindex="0" class="hidden"> <label></label> </div> --> </div> <button class="fluid mini ui red button" type="submit"><i class="large paypal icon"></i> </button> </form>

users/forms.py:

class UserRechargeForm(forms.ModelForm):
    class Meta:
        model = UserBalance
        fields = ["pay_type", "amount", "admin_pay_type", "currency", "rate", "a_type"]

users/view.py:

class MyRechargeView(LoginRequiredMixin, View):
    def get(self, request):
        return render(request, "recharge.html", {})

    def post(self, request):
        user = UserProfile.objects.get(username=request.user.username)
        new_recharge = UserBalance(user=user)
        user_balance_form = UserRechargeForm(request.POST, instance=new_recharge)

        if user_balance_form.is_valid():
            user_balance_form.save()
            return HttpResponseRedirect(reverse("/"))
        else:
            user_balance_form = UserRechargeForm()

        return render(request, "recharge.html", {"user_balance_form": user_balance_form})
Mar.02,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1ea1497-4791d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ea1497-4791d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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