code: public BaseAttacher start() {
  
          if(mAdapterView == null) {
              throw new IllegalStateException("Adapter View cannot be null");
          }
  
          if(mMugenCallbacks == null) {
              throw new IllegalStateException("MugenCallbacks cannot be null");
          }
  
          if(mLoadMoreOffset <= 0) {
              throw new IllegalStateException("Trigger Offset must be > 0");
          }
          mIsLoadMoreEnabled = true;
          init();
          return this;
      }
docs: Begin load more on the attached Adapter View
  
  @throws java.lang.IllegalStateException If any configuration is incorrect