在Android中阅读POS标签模型

我尝试从外部存储中获取.bin文件以及将其放在外部库中但仍无法正常工作.这些是我的代码：

InputStream modelIn = null;
POSModel model = null;

String path = Environment.getExternalStorageDirectory().getPath() + "/TextSumIt/en-pos-maxent.bin";

modelIn = new BufferedInputStream( new FileInputStream(path));
model = new POSModel(modelIn);

我得到的错误：

11-15 06:39:35.072: W/System.err(565): opeNNLp.toolS.Util.InvalidFormatException: The profile data stream has an invalid format!
11-15 06:39:35.177: W/System.err(565):  at opeNNLp.tools.Dictionary.serializer.Dictionaryserializer.create(Dictionaryserializer.java:224)
11-15 06:39:35.177: W/System.err(565):  at opeNNLp.tools.postag.POSDictionary.create(POSDictionary.java:282)
11-15 06:39:35.182: W/System.err(565):  at opeNNLp.tools.postag.POSModel$POSDictionaryserializer.create(POSModel.java:48)
11-15 06:39:35.182: W/System.err(565):  at opeNNLp.tools.postag.POSModel$POSDictionaryserializer.create(POSModel.java:44)
11-15 06:39:35.182: W/System.err(565):  at opeNNLp.toolS.Util.model.baseModel.<init>(BaseModel.java:135)
11-15 06:39:35.197: W/System.err(565):  at opeNNLp.tools.postag.POSModel.<init>(POSModel.java:93)
11-15 06:39:35.197: W/System.err(565):  at com.main.textsumit.SummarizationActivity.postagWords(SummarizationActivity.java:676)
11-15 06:39:35.205: W/System.err(565):  at com.main.textsumit.SummarizationActivity.generateSumMary(SummarizationActivity.java:252)
11-15 06:39:35.205: W/System.err(565):  at com.main.textsumit.SummarizationActivity.onCreate(SummarizationActivity.java:127)

是什么导致它没有正确阅读模型？我该如何解决这个问题呢？请帮忙.

谢谢.