一直在报这个错误，百度上找了好多方法都不行，老师可以帮我解答下吗
android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=file:///data/data/com.wangwang.updatedemo/cache/target.apk typ=application/vnd.Android.package-archive flg=0x10000000 }
