Magento 1.9 - What is the error in my Observer?

[Aveeva]

I just want to display if order placed from  selected customer group display "You are Tester",

My observer :

\app\etc\modules\Gta_FindPaymentGateway.xml

<?xml version="1.0" encoding="UTF-8"?>
<config>
    <modules>
        <Gta_FindPaymentGateway>
            <active>true</active>
            <codePool>local</codePool>
        </Gta_FindPaymentGateway>
    </modules>
</config>

app\code\local\Gta\FindPaymentGateway\etc\config.xml

<?xml version="1.0"?>
<config>
    <modules>
        <Gta_FindPaymentGateway>
            <version>1.0.0</version>
        </Gta_FindPaymentGateway>
    </modules>
    <global> 
        <models>
            <gta_findpaymentgateway>
                <class>Gta_FindPaymentGateway_Model</class>
            </gta_findpaymentgateway>
        </models>
    </global>   
    <frontend>
        <events>
            <sales_order_place_before>
                <observers>
                    <Gta_FindPaymentGateway_Model_Observer>   
                        <type>singleton</type>
                        <class>Gta_FindPaymentGateway_Model_Observer</class>
                        <method>paymenter</method>
                    </Gta_FindPaymentGateway_Model_Observer>
                </observers>
            </sales_order_place_before>      
        </events>
    </frontend>
    </global>   
</config>

app\code\local\Gta\FindPaymentGateway\Model\Observer.php

<?php
    class Gta_FindPaymentGateway_Model_Observer
    {
        public function paymenter($Observer)
        {
            $order = $Observer->getEvent()->getOrder();
            $login = $order-> Mage::getSingleton( 'customer/session' )->isLoggedIn(); 
            if($login)
            {
                $groupId = Mage::getSingleton('customer/session')->getCustomerGroupId();
                   if($groupId == 2) 
                {
                    mage::log('You are Tester',null,'my_test.log',true);
                }
            }
        }
    }

Log file not created.

[Rahul Gupta]

@Aveeva Please replace mage with Mage in below code.

mage::log('You are Tester',null,'my_test.log',true);

Thanks

[Aveeva]

Still not working. 

observer :

<?php
    class Gta_FindPaymentGateway_Model_Observer
    {
        public function paymenter($Observer)
        {
            $order = $Observer->getEvent()->getOrder();
            $login = $order-> Mage::getSingleton( 'customer/session' )->isLoggedIn(); 
            if($login)
            {
                $groupId = Mage::getSingleton('customer/session')->getCustomerGroupId();
                   if($groupId == 2) 
                {
                    Mage::log('You are Tester',null,'my_test.log',true);
                }
            }
        }
    }

[Mukesh Tiwari]

Hi @Aveeva 

Move 

 Mage::log('You are Tester',null,'my_test.log',true);

before  

   if($groupId == 2) 
   {

 like 

  Mage::log($groupId, null, 'my_test.log', true);
  if($groupId == 2) 
  {

 and see if it works. (Is it logging the groupid?)

[Aveeva]

@Mukesh Tiwari  Observer.php

<?php
    class Gta_FindPaymentGateway_Model_Observer
    {
        public function paymenter($Observer)
        {
            $order = $Observer->getEvent()->getOrder();
            $login = $order-> Mage::getSingleton( 'customer/session' )->isLoggedIn(); 
            if($login)
            {
                $groupId = Mage::getSingleton('customer/session')->getCustomerGroupId();
                Mage::log('Line no - 11'. $groupId,null,'my_test1.log',true);
                if($groupId == 2) 
                {
                    Mage::log('You are Tester',null,'my_test.log',true);
                }
            }
        }
    }
?>

still not creating log file.

[Aveeva]

@Mukesh Tiwari @Rahul Gupta  I just want try to print what event i am using, 

<?php
    class Gta_FindPaymentGateway_Model_Observer

    {
        public function paymenter($Observer)
        {
             $order = $Observer->getEvent();
             Mage::log($order->getName(),null,'event.log',true);  

        }
    }
?>

Above script not print log.

My config.xml file,

<?xml version="1.0"?>
<config>
    <modules>
        <Gta_FindPaymentGateway>
            <version>1.0.0</version>
        </Gta_FindPaymentGateway>
    </modules>
    <global> 
        <models>
            <gta_findpaymentgateway>
                <class>Gta_FindPaymentGateway_Model</class>
            </gta_findpaymentgateway>
        </models>   
        <events>
            <sales_order_place_before>
                <observers>
                    <Gta_FindPaymentGateway_Model_Observer>   
                        <type>singleton</type>
                        <class>Gta_FindPaymentGateway_Model_Observer</class>
                        <method>paymenter</method>
                    </Gta_FindPaymentGateway_Model_Observer>
                </observers>
            </sales_order_place_before>      
        </events>
    </global>   
</config>

[Mukesh Tiwari]

Change from following

<Gta_FindPaymentGateway_Model_Observer>   
           <type>singleton</type>
           <class>Gta_FindPaymentGateway_Model_Observer</class>
            <method>paymenter</method>
</Gta_FindPaymentGateway_Model_Observer>

to 

<gta_findpaymentgateway_model_observer>   
        <type>singleton</type>
        <class>Gta_FindPaymentGateway_Model_Observer</class>
        <method>paymenter</method>
</gta_findpaymentgateway_model_observer>

and then check the results.

[Aveeva]

@Mukesh Tiwari  After change 

<gta_findpaymentgateway_model_observer>

 Still not working.