magento - Mage registry key "_singleton/" already exists error -

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i know there lot of posts have seen , didn't find error in code bellow : config.xml :

<events>             <core_block_abstract_to_html_after>                 <observers>                         <type>singleton</type>                         <class>webdirect_customprice_model_observer</class>                         <method>convertpricespantoinput</method>                 </observers>             </core_block_abstract_to_html_after>         </events>

observer class : 

class webdirect_customprice_model_observer {     const module_name = 'webdirect_customprice';     public function convertpricespantoinput($observer = null)     {         if (!$observer) {             return;         }         if ('product.info.simple' == $observer->getevent()->getblock()->getnameinlayout()) {             if (!mage::getstoreconfig('advanced/modules_disable_output/'.self::module_name)) {                 $transport = $observer->getevent()->gettransport();                 $block = new webdirect_customprice_block_pricespantoinput();                 $block->setpassingtransport($transport['html']);                 $block->tohtml();             }         }         return $this;     } }

and class add custom javascript in product view page : 

class webdirect_customprice_block_pricespantoinput extends mage_core_block_text {     //protected $_nameinlayout = 'selectify.qty_input_to_select';     //protected $_alias = 'qty_input_to_select';     public function setpassingtransport($transport)     {         $this->setdata('text', $transport.$this->_generateqtyinputtoselecthtml());     }     private function _generatepricespantoinputhtml()     {         $price = mage::registry('current_product')->getprice();         $product_id = mage::registry('current_product')->getid();          return '             <script type="text/javascript">             //<![cdata[             document.observe("dom:loaded", function() {                 $("product-price-'.$product_id.'").replace(\'<span class="price" id="product-price-'.$product_id.'">&nbsp;<input type="text" id="cp_id" class="input-text price" name="custom_price" style="width:auto;" value="'.$price.'" onchange="onchangecp(this);"/></span><input type="hidden" id="custom_price_total" name="custom_price_total" value="'.$price.'">\');             });             //]]>             </script>         ';     } }

is there error in code ? can't see anything!

the issue in defining observer function in config.xml.

        <events>             <core_block_abstract_to_html_after>                 <observers>                         <type>singleton</type>                         <class>webdirect_customprice_model_observer</class>                         <method>convertpricespantoinput</method>                 </observers>             </core_block_abstract_to_html_after>         </events>

should replaced by:

       <events>             <core_block_abstract_to_html_after>                 <observers>                     <some_unique_identifier>                         <type>singleton</type>                         <class>webdirect_customprice_model_observer</class>                         <method>convertpricespantoinput</method>                     </some_unique_identifier>                 </observers>             </core_block_abstract_to_html_after>         </events>

where "some_unique_identifier" can unique string.


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