Fatal error in Abstract.php

[ColumbiaCoat]

Hi All,

I've developed an issue while designing a theme.  when I click on a product I get this error.

Fatal error: Call to a member function addToChildGroup() on null in /home/columbiacoat/webapps/mage192_3/app/code/core/Mage/Core/Block/Abstract.php on line 815

however I'm not seeing an error in the abstract.php line 815 is :  $this->getParentBlock()->addToChildGroup($groupName, $this);

  /**
     * Add self to the specified group of parent block
     *
     * @param string $groupName
     * @return Mage_Core_Block_Abstract
     */
    public function addToParentGroup($groupName)
    {
        $this->getParentBlock()->addToChildGroup($groupName, $this);
        return $this;
    }

Any Help is greatly appreciated!

[ColumbiaCoat]

Found it on my own, there was an error in the catalog.xml