I have fixed it!
My problem was due to incompatible versions of the components of the slf4j library.
The project used the following:
slf4j-api-1.5.2.jar
slf4j-log4j12-1.5.3.jar
but they aren't compatible.
slf4j-api-1.5.2.jar was replaced by slf4j-api-1.5.3.jar and now it works!



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