Hello,
This either occurs due to:
a) You are installing the wrong version of the Template for your CMS. Such as trying to install a J2.5 Template to a J3.0 installation
b) You are trying to install a Site Shaper via the Extension Manager. Site Shapers must be installed as new installations as per our Tutorials here:
http://www.shape5.com/joomla_tutorials.htmlRegards,
-Mike