Installed Tomcat 7.0 to no avail. Still get the same error. It appears to be lacking a jasperserver db connection when it tires to display the root structure from the db. Once a connection is mad either by creating a new folder or by using the Library tab, then all is well. Attempts were made to do a "lazyLoad = false" setting but I did not know where to apply it and was only guessing that this was the solution. Reinstallation of 4.7 did not work. Installing 4.5 then 4.7 did not work. Installing Tomcat 7.0 did not work. Wonder what will?