java.lang.NoClassDefFoundError: org/python/core/pyobject in Windows

I am unable to start 2019-07-13_10:11 (Build 325) on Windows 8.1, I get following error message in command prompt:

Exception in thread "main" java.lang.NoClassDefFoundError: org/python/core/PyObject
 at java.lang.Class.getDeclaredConstructors0(Native Method)
 at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
 at java.lang.Class.getConstructor0(Unknown Source)
 at java.lang.Class.getConstructor(Unknown Source)
 at org.sikuli.script.support.Runner.initRunners(Runner.java:56)
 at org.sikuli.script.support.Runner.getRunners(Runner.java:101)
 at org.sikuli.idesupport.IDESupport.init(IDESupport.java:83)
 at org.sikuli.ide.SikulixIDE.main(SikulixIDE.java:85)
Caused by: java.lang.ClassNotFoundException: org.python.core.PyObject
 at java.net.URLClassLoader.findClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 ... 8 more