Error when setting up payment plan

[modernd]

Im trying to add a simple payment plan to test the add to cart on my website, but im receiving this error?

( ! ) SCREAM: Error suppression ignored for
( ! ) Fatal error: Class 'vmPaymentPlugin' not found in C:\wamp\www\mds\plugins\vmpayment\authorize\authorize.php on line 21
Call Stack
#   Time   Memory   Function   Location
1   0.0009   717248   {main}( )   ..\index.php:0
2   0.1273   7516936   JAdministrator->dispatch( )   ..\index.php:46
3   0.1337   8039136   JComponentHelper::renderComponent( )   ..\application.php:153
4   0.1493   8467288   JComponentHelper::executeComponent( )   ..\helper.php:351
5   0.1502   8548184   require_once( 'C:\wamp\www\mds\administrator\components\com_virtuemart\admin.virtuemart.php' )   ..\helper.php:383
6   0.2209   11646600   JController->execute( )   ..\admin.virtuemart.php:81
7   0.2209   11646680   VirtuemartControllerPaymentmethod->save( )   ..\controller.php:761
8   0.2225   11652152   VmController->save( )   ..\paymentmethod.php:54
9   0.2316   12348960   VirtueMartModelPaymentmethod->store( )   ..\vmcontroller.php:162
10   0.2346   12506472   JPluginHelper::importPlugin( )   ..\paymentmethod.php:179
11   0.2347   12511672   JPluginHelper::_import( )   ..\helper.php:125
12   0.2369   12708968   require_once( 'C:\wamp\www\mds\plugins\vmpayment\authorize\authorize.php' )   ..\helper.php:171

Its in the joomla design that i edit the a href link in the html to my store, but i cant manage to get this right?

Template im trying to edit - the add to cart button i'd like when client clicks add to cart button it takes them to virtuemart check out screen?
http://livedemo00.template-help.com/joomla_33234/

This is the html code i need to edit in the article for this menu in joomla:

<p class="price"><span class="sign">R</span>2499<span class="month"><br /></span></p>
<ul>
<li><a href="#">Corporate Logo Design</a></li>
<li><a href="#">Business Card Design</a></li>
<li><a href="#">Letterhead Design</a></li>
<li><a href="#">1x Banner Design</a></li>
<li><a href="#">A5 / A6 Flyer Design</a></li>
<li><a href="#">T&amp;C's Apply</a></li>
</ul>
<div class="add-cart">
<p class="button"><a href="#"><span>Save R250</span></a></p>
</div>

I have the latest VM installed -
You already have the latest version

Installed version 2.0.12e
Latest version 2.0.12e

Please can someone help me, the site is on localhost at the moment, but when i try add a payment option i receive all these issues...where did i go wrong and how do i fix this that when i click on add to cart it takes me to check out and to have cash payment, paypal or which ever one for me to check out successfully please?

This was the reply from template support:
[08:25:46] Stacy: Go to Menus - open any menu - add new item - choose Virtuemart item menu type - create menu
[08:26:02] Stacy: in the Link field of this menu copy the Virtuemart menu url
[08:26:10] Stacy: and insert it into this link <p><a href="#"><span>Add to cart</span></a></p>
[08:26:19] Stacy: after you can delete the Virtuemart menu you have created


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