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1. 

   hbdgas
   Member

   Hello,

   I am trying to write some audio sampling code for a school project, and when I hit the compile button in the IDE I receive the following error:

   Something went wrong. Exception received:

   java.lang.NullPointerException
   at processing.app.debug.Compiler.contentsToClassPath(Compiler.java:638)
   at processing.app.Sketch.preprocess(Sketch.java:1338)
   at processing.app.Sketch.preprocess(Sketch.java:1258)
   at processing.app.Sketch.build(Sketch.java:1211)
   at processing.app.Sketch.compile(Sketch.java:1182)
   at processing.app.Editor$43.run(Editor.java:1550)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

   I have no idea what is going wrong and any help would be greatly appreciated.
   I'm running the IDE on Windows XP.
   Thanks

   Posted 4 years ago #
2. 

   gbulmer
   Moderator

   Have you checked the IDE is still working by uploading something simple like Blink?

   Have you tried 'divide and conquer' to reduce the problem cause?
   By this I mean something very simple:
   1. make a backup copy of your code, then
   2. delete as much of it as you can until that error disappears, then
   3. start putting pieces of the original back in until it breaks again, and you are looking at one line of code that cause the error.

   Posted 4 years ago #
3. 

   hbdgas
   Member

   Thanks for the reply. I tried some divide and conquer by commenting out all but the most basic parts of the code, and still got the error. I will try getting Blink to work tomorrow when I'm back in the lab. Tonight a friend also suggested that something may have happened to the IDE from the look of the message.

   Posted 4 years ago #
4. 

   hbdgas
   Member

   It appears that the #include<SDFatUtil.h> from the MapleSDFat library was giving me trouble. I removed it and the code compiles.

   Posted 4 years ago #

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