Welcome!
RocketSites is going to install "ezsnap.virtstage.com" on this staging server.
Your .htaccess is different from what RocketSites CMS needs in order to work properly.
You can compare the current .htaccess file against what RocketSites CMS will install:Current .htaccess vs. To be Installed .htaccess
You must confirm with one of the options below before proceeding: Keep current .htaccess Install new .htaccess