谷歌播放控制台反混淆崩溃

Question

我很难对Google Play控制台崩溃进行反渗透。该应用程序包含一个使用proguard的库。我希望能够解决库中发生的崩溃问题。我上传了mapping.txt文件，但崩溃日志看起来仍然很奇怪。它的一些例子如下：

java.lang.NullPointerException: 
  at com.my.lib.MyWriter.writeTo (MyWriter.java)
  at <OR>.readFrom (MyWriter.java)
  at <OR>.readStringFrom (MyWriter.java)
  at <OR>.writeStringTo (MyWriter.java)
  at <OR>.getSize (MyWriter.java)
  at <OR>.sizeOf (MyWriter.java)
  at com.my.lib.ModelObject.getProperty (ModelObject.java)
  at <OR>.setProperty (ModelObject.java)
  at <OR>.setProperty (ModelObject.java)
  at <OR>.setProperty (ModelObject.java)
  at <OR>.writeTo (ModelObject.java)
  at <OR>.readFrom (ModelObject.java)
  at <OR>.getSize (ModelObject.java)

那些<OR>是什么意思？崩溃日志几乎用它们的方法列出了库中的一些对象。我该怎么读？