There is a message "Error: Could not find or load main class com.serotonin.m2m2.Main" when I try to open mango 2.5.2.
Can't open manggo 2.5.2
Please see the installation tutorials in our wiki: http://infiniteautomation.com/wiki/doku.php?id=installation
Let us know if this helps resolve your issue. My guess is you don't have your JAVA_HOME set correctly. If you still have issues please post the full out put of the terminal when starting up.