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Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference	at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:746)	at java.util.concurrent.ConcurrentHashMap.containsKey(ConcurrentHashMap.java:774)	at cn.aigestudio.downloader.bizs.DLManager.dlStop(DLManager.java:267)	at cn.aigestudio.downloader.bizs.DLManager.dlCancel(DLManager.java:286)	at com.seowhy.video.util.CacheUtils.deleteLessonCache(CacheUtils.java:299)	at com.seowhy.video.util.CacheUtils.deleteCourseCache(CacheUtils.java:397)	at com.seowhy.video.adapter.UserCacheApapter$CacheViewHolder.onBtnDeteleClick(UserCacheApapter.java:110)	at com.seowhy.video.adapter.UserCacheApapter$CacheViewHolder$$ViewBinder$2.doClick(UserCacheApapter$CacheViewHolder$$ViewBinder.java:34)