2.8.1 No implementation found for native nativeOpenDocument

Please forgive not using latest version, but I have some 600 deployments out there using 2.8.1.

My problem is that some of them are not displaying the documents and some of them work fine. All are running the same version of the software. All are Android 4.2 tablets.

So, using this code:

      final PDFView v = (PDFView) mainView.findViewById(R.id.pdf_layout);
      v.fromFile(new File(Documents.currentDoc)).onRender(new OnRenderListener() {
        @Override
        public void onInitiallyRendered(int nbPages, float pageWidth, float pageHeight)
        {
          v.fitToWidth();
        }
      }).load();

Displaying the SAME PDF works fine on one tablet and not at all on another. Here’s what logcat says (for the non-working ones):

10:24:30.476 3859  4082                 dalvikvm W No implementation found for native Lcom/shockwave/pdfium/PdfiumCore;.nativeOpenDocument:(ILja
                                         va/lang/String;)J
10:24:30.486 3859  3859                  PDFView E load pdf error
10:24:30.486 3859  3859                  PDFView E java.lang.UnsatisfiedLinkError: Native method not found: com.shockwave.pdfium.PdfiumCore.nati
                                         veOpenDocument:(ILjava/lang/String;)J
10:24:30.486 3859  3859                  PDFView E at com.shockwave.pdfium.PdfiumCore.nativeOpenDocument(Native Method)
10:24:30.486 3859  3859                  PDFView E at com.shockwave.pdfium.PdfiumCore.newDocument(PdfiumCore.java:113)
10:24:30.486 3859  3859                  PDFView E at com.github.barteksc.pdfviewer.source.FileSource.createDocument(FileSource.java:38)
10:24:30.486 3859  3859                  PDFView E at com.github.barteksc.pdfviewer.DecodingAsyncTask.doInBackground(DecodingAsyncTask.java:53)<
                                         /span>
10:24:30.486 3859  3859                  PDFView E at com.github.barteksc.pdfviewer.DecodingAsyncTask.doInBackground(DecodingAsyncTask.java:25)<
                                         /span>
10:24:30.486 3859  3859                  PDFView E at android.os.AsyncTask$2.call(AsyncTask.java:287)
10:24:30.486 3859  3859                  PDFView E at java.util.concurrent.FutureTask.run(FutureTask.java:234)
10:24:30.486 3859  3859                  PDFView E at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
10:24:30.486 3859  3859                  PDFView E at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
10:24:30.486 3859  3859                  PDFView E at java.lang.Thread.run(Thread.java:856)

Any hints as to what might be wrong here? It’s not a problem moving to a newer version if this is a known issue, but I’d sure like to know what’s going on too, if at all possible.