API Component Error

Hi,

I just installed com_api-v3.0&2.5.zip into Joomla 3.1.5

Clicking on the component link in the administrator throws a blank page and the following error comes up in the error log:

[25-Sep-2013 10:26:25 UTC] PHP Fatal error: Class 'ApiControllerAdmin' not found in /home/*********/public_html/dev/administrator/components/com_api/api.php on line 36

Any ideas?