Crash on calibration/not working

[Marcel Hojski]

(installed version 1.2.2) on ubuntu-mate 16.04 the app crashes on calibration, cant tell if it`s working at this time...

sudo yawls -c
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/opencv/core/Core : 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 com.blogspot.thedsweb.engine.Brightness.<clinit>(Unknown Source)
 at com.blogspot.thedsweb.main.Yawls.automatic(Unknown Source)
 at com.blogspot.thedsweb.main.Yawls.main(Unknown Source)