file.java

java.lang.NullPointerException: Attempt to invoke interface method 'void com.etiennelawlor.imagegallery.library.adapters.ImageGalleryAdapter$ImageThumbnailLoader.loadImageThumbnail(android.widget.ImageView, java.lang.String, int)' on a null object reference
                      at com.etiennelawlor.imagegallery.library.activities.ImageGalleryActivity.loadImageThumbnail(ImageGalleryActivity.java:101)
                      at com.etiennelawlor.imagegallery.library.adapters.ImageGalleryAdapter.onBindViewHolder(ImageGalleryAdapter.java:58)
                      at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:6062)
                      at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:6095)
                      at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5277)
                      at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5153)
                      at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2061)
                      at android.support.v7.widget.GridLayoutManager.layoutChunk(GridLayoutManager.java:562)
                      at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1408)
                      at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:580)
                      at android.support.v7.widget.GridLayoutManager.onLayoutChildren(GridLayoutManager.java:170)
                      at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3374)
                      at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3183)
                      at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3627)
                      at android.view.View.layout(View.java:17938)
                      at android.view.ViewGroup.layout(ViewGroup.java:5812)
                      at android.widget.FrameLayout.layoutChildren(FrameLayout.java:344)
                      at android.widget.FrameLayout.onLayout(FrameLayout.java:281)
                      at android.view.View.layout(View.java:17938)
                      at android.view.ViewGroup.layout(ViewGroup.java:5812)
                      at android.widget.FrameLayout.layoutChildren(FrameLayout.java:344)
                      at android.widget.FrameLayout.onLayout(FrameLayout.java:281)
                      at android.view.View.layout(View.java:17938)
                      at android.view.ViewGroup.layout(ViewGroup.java:5812)
                      at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1742)
                      at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
                      at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
                      at android.view.View.layout(View.java:17938)
                      at android.view.ViewGroup.layout(ViewGroup.java:5812)
                      at android.widget.FrameLayout.layoutChildren(FrameLayout.java:344)
                      at android.widget.FrameLayout.onLayout(FrameLayout.java:281)
                      at android.view.View.layout(View.java:17938)
                      at android.view.ViewGroup.layout(ViewGroup.java:5812)
                      at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1742)
                      at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
                      at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
                      at android.view.View.layout(View.java:17938)
                      at android.view.ViewGroup.layout(ViewGroup.java:5812)
                      at android.widget.FrameLayout.layoutChildren(FrameLayout.java:344)
                      at android.widget.FrameLayout.onLayout(FrameLayout.java:281)
                      at com.android.internal.policy.PhoneWindow$DecorView.onLayout(PhoneWindow.java:3193)
                      at android.view.View.layout(View.java:17938)
                      at android.view.ViewGroup.layout(ViewGroup.java:5812)
                      at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2666)
                      at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2367)
                      at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1437)
                      at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7403)
                      at android.view.Choreographer$CallbackRecord.run(Choreographer.java:920)
                      at android.view.Choreographer.doCallbacks(Choreographer.java:695)
                      at android.view.Choreographer.doFrame(Choreographer.java:631)
                      at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:906)
                      at android.os.Handler.handleCallback(Handler.java:739)
                      at android.os.Handler.dispatchMessage(Handler.java:95)