java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.example.lalameesh.booklistingapp.bookitem.getBookName()' on a null object reference

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Attempt to invoke virtual method 'java.lang.String com.example.lalameesh.booklistingapp.bookitem.getBookName()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.example.lalameesh.booklistingapp.bookitem.getBookName()' on a null object reference
at com.example.lalameesh.booklistingapp.BookActivity.updateUi(BookActivity.java:57)

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