Looks like a crossdomain issue. Have you allowed
http://advert.**visionimpact.co.in**
in your crossdomain xml file?
If you are serving your ads from a different domain name than the flash player, you need to install a crossdomain.xml file in the docroot on your openX ad server to allow flash to communicate to it.
Example crossdomain xml :
<?xml version="1.0"?>
<!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">
<cross-domain-policy>
<allow-access-from domain="*"/>
</cross-domain-policy>
Ref : http://code.google.com/p/openx-iab-vast/wiki/ExampleCrossdomainXML