[TYPO3-english] An error occurred while trying to call any action

[Sejal]

Hi,

I have an error while trying to call action.
In my index.html file, 
<f:for each="{categories}" as="category" iteration="categoryIterator">
    <f:link.action action="view" arguments="{category: category}">
And when this link is clicked it shows an error 
"An error occurred while trying to call Tx_IapPremium_Controller_CategoryController->viewAction(). "

In the controller,
/**
	 * @param Tx_IapPremium_Domain_Model_Category $category
	 * @return the rendered view
	 */
	public function viewAction(Tx_IapPremium_Domain_Model_Category $category) {
}

But it is not going inside this function when I removed model from argument then it is going in the function.

Can anyone tell me what is wrong here?

Thanks