java.lang.NullPointerException at com.google.gwt.dev.util.DiskCache.transferToStream(DiskCache.java:187)

GWT 2.5.1

Maven 3.0.4

Hi, suddenly I get this error, and I google it for a while now, and can see others had the problem.

But no solution... 

 java.lang.NullPointerException

[ERROR]  at com.google.gwt.dev.util.DiskCache.transferToStream(DiskCache.java:187)

[ERROR]  at com.google.gwt.dev.util.DiskCacheToken.writeObject(DiskCacheToken.java:91)

[ERROR]  at sun.reflect.GeneratedMethodAccessor24.invoke(Unknown Source)

[ERROR]  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

I did delete the gwt-unitCache folder, I deleted everything under target ( maven project ) 

I have space left on my disk. 

Attached a file with the full output.. 

Thanks. 

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