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ProM doesn't allow to import any files
I am trying to import in ProM files (I have tried different file formats as pnml, xes), however it doesn't allow me to do that. I tried to install and launch ProM 6.1. When I click on Import, it gives me window for selecting the file, I select the file and then the window is closed and absolutely nothing happens.
I also tried launching ProM with Eclipse and importing files and it gives me following error
Exception in thread "Thread-3" java.lang.NullPointerException
at java.util.TreeMap.getEntryUsingComparator(Unknown Source)
at java.util.TreeMap.getEntry(Unknown Source)
at java.util.TreeMap.get(Unknown Source)
at java.lang.Thread.run(Unknown Source)
I am using Windows 7, 64 bit, java 1.7.0, Eclipse SDK 3.7.0.
I would appreciate if someone could tell me what the problem is.