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Astah stopped working after upgrading ubuntu

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Hello, so as the title says I had astah working just fine, but I upgraded ubuntu to the newest version (18.04) and now It doesnt work anymore, I already tried to remove astah completely through synaptic and installing again but nothing changed

I can't do anything basically.If i try to open a existing file or create a new one nothing happens for a long time, but after a while i get this message "An exception has occurred. Please restart Astah"

Here is the 2 logs

https://pastebin.com/nVTgmPvv https://pastebin.com/rXkvmVS4

Product: Astah Professional

Ubuntu error

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replies

Exception in thread "main" java.lang.UnsupportedClassVersionError: JP/co/esm/caddies/jomt/Jude : Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:803) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) at java.net.URLClassLoader.access$100(URLClassLoader.java:71) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)

Product: Astah Professional

Page: 1