Cant open app

[P0guinho]

I tried running RRPathGen with the executable jar file but it doesnt open. I tried deleting and downloading the file again and ending all java related tasks in the task manager, but still, the app doesnt even appear.
I also tried running the file with the command prompt with: java -jar C:\Users\gabri\Documents\RRPathGen-1.7.0.jar, but it gives the error:

java.lang.NumberFormatException: For input string: "13,78"
        at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
        at sun.misc.FloatingDecimal.parseDouble(Unknown Source)
        at java.lang.Double.parseDouble(Unknown Source)
        at rrpathgen.data.ProgramProperties.reload(ProgramProperties.java:38)
        at rrpathgen.data.ProgramProperties.<init>(ProgramProperties.java:32)
        at rrpathgen.Main.loadConfig(Main.java:87)
        at rrpathgen.Main.<init>(Main.java:46)
        at rrpathgen.Main$1.run(Main.java:56)
        at java.awt.event.InvocationEvent.dispatch(Unknown Source)
        at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
        at java.awt.EventQueue.access$500(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at rrpathgen.gui.DrawPanel.update(DrawPanel.java:42)
        at rrpathgen.gui.DrawPanel.<init>(DrawPanel.java:114)
        at rrpathgen.Main.initComponents(Main.java:98)
        at rrpathgen.Main.<init>(Main.java:47)
        at rrpathgen.Main$1.run(Main.java:56)
        at java.awt.event.InvocationEvent.dispatch(Unknown Source)
        at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
        at java.awt.EventQueue.access$500(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)