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java.lang.IllegalStateException: mContentView is null 	at com.canyinghao.canrefresh.CanRefreshLayout.onFinishInflate(CanRefreshLayout.java:434)	at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:844)	at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70)	at android.view.LayoutInflater.rInflate(LayoutInflater.java:811)	at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)	at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:838)	at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70)	at android.view.LayoutInflater.rInflate(LayoutInflater.java:811)	at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)	at android.view.LayoutInflater.inflate(LayoutInflater.java:515)