java.lang.NoClassDefFoundError: processing/core/PApplet

[ottojo]

Won't start

C:\Program Files (x86)\Arduino>arduino_debug.exe
Loading configuration...
Initializing packages...
Preparing boards...
Ungültige Bibliothek C:\Program Files (x86)\Arduino\libraries\Firmata in Librar
can't use both 'src' and 'utility' folders. gefunden
Ungültige Bibliothek C:\Program Files (x86)\Arduino\libraries\Firmata in Librar
can't use both 'src' and 'utility' folders. gefunden
Ungültige Bibliothek C:\Program Files (x86)\Arduino\libraries\Firmata in Librar
can't use both 'src' and 'utility' folders. gefunden
Ungültige Bibliothek C:\Program Files (x86)\Arduino\libraries\Firmata in Librar
can't use both 'src' and 'utility' folders. gefunden
Starting...
java.lang.NoClassDefFoundError: processing/core/PApplet
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:1
2)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at processing.app.Editor.addTools(Editor.java:926)
at processing.app.Editor.buildToolsMenu(Editor.java:784)
at processing.app.Editor.buildMenuBar(Editor.java:543)
at processing.app.Editor.(Editor.java:233)
at processing.app.Base.handleOpen(Base.java:899)
at processing.app.Base.handleOpen(Base.java:884)
at processing.app.Base.handleOpen(Base.java:880)
at processing.app.Base.handleNew(Base.java:768)
at processing.app.Base.(Base.java:477)
at processing.app.Base.guardedMain(Base.java:226)
at processing.app.Base.main(Base.java:137)
Caused by: java.lang.ClassNotFoundException: processing.core.PApplet
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 24 more

[ffissore]

Have you downloaded version 1.6.5-r2?

[ottojo]

yes, latest version.

[ffissore]

Do you have a tool under C:\Program Files (x86)\Arduino\tools? Which tool is it?

[ottojo]

there is a howto.txt and a folder "Mangler"

[ffissore]

And do you have a tool in your sketchbook folder? Documents\Arduino\tools (if your sketchbook folder is the default one). Which tool is it?

[ffissore]

anyway, you should remove it: it's the cause of your issue

[ottojo]

yes i had tools in my documents folder. i deleted them and now everything is working again!

Thank You!