Error in My Application

[Radwen ANIBA]

Hi ,

My application run without any problem except at the end it shows this
message and I don't really know why

Exception in thread "BaseCPMImpl-Thread" java.lang.NullPointerException
    at
org.apache.uima.collection.impl.cpm.BaseCPMImpl.run(BaseCPMImpl.java:537)
    at java.lang.Thread.run(Thread.java:619)

And the process do not finish till I kill it

Any idea ?

Rad