Loading trained model (DoccatModel) throws exception

loading traindModel (bin file) throws exception I used this code to load the bin file :

InputStream inputStream = DocumentCategrizer.class.getClassLoader().getResourceAsStream("trainedModel/en-sport.bin");
DoccatModel doccatModel = new DoccatModel(inputStream);

and this is the exception I'm facing :

SEVERE: null
opennlp.tools.util.InvalidFormatException: Entry name must have type extension:
at opennlp.tools.util.model.BaseModel.getEntryExtension(BaseModel.java:324)
at opennlp.tools.util.model.BaseModel.loadModel(BaseModel.java:222)
at opennlp.tools.util.model.BaseModel.<init>(BaseModel.java:181)
at opennlp.tools.doccat.DoccatModel.<init>(DoccatModel.java:48)