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java.io.IOException: Unknown font subtype=COSName{}	at org.pdfbox.pdmodel.font.PDFontFactory.createFont(PDFontFactory.java:103)	at org.pdfbox.pdmodel.PDResources.getFonts(PDResources.java:135)	at org.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:178)	at org.pdfbox.util.PDFStreamEngine.processStream(PDFStreamEngine.java:160)	at org.pdfbox.util.PDFTextStripper.processPage(PDFTextStripper.java:355)	at org.pdfbox.util.PDFTextStripper.processPages(PDFTextStripper.java:268)	at org.pdfbox.util.PDFTextStripper.writeText(PDFTextStripper.java:220)	at com.atlassian.bonnie.search.extractor.PdfContentExtractor.extractText(PdfContentExtractor.java:49)	at com.atlassian.bonnie.search.extractor.BaseAttachmentContentExtractor.addFields(BaseAttachmentContentExtractor.java:39)	at com.atlassian.confluence.plugin.descriptor.ExtractorModuleDescriptor$BackwardsCompatibleExtractor.addFields(ExtractorModuleDescriptor.java:43)	at com.atlassian.bonnie.search.BaseDocumentBuilder.getDocument(BaseDocumentBuilder.java:104)	at com.atlassian.confluence.search.lucene.ConfluenceDocumentBuilder.getDocument(ConfluenceDocumentBuilder.java:102)	at com.atlassian.confluence.search.lucene.tasks.AddDocumentIndexTask.perform(AddDocumentIndexTask.java:41)	at com.atlassian.bonnie.index.TempIndexWriter.perform(TempIndexWriter.java:72)	at com.atlassian.confluence.search.lucene.TempIndexWriterStrategy.perform(TempIndexWriterStrategy.java:43)	at com.atlassian.confluence.search.lucene.tasks.TempIndexBackedIndexTaskPerformer.perform(TempIndexBackedIndexTaskPerformer.java:21)	at com.atlassian.confluence.search.lucene.DefaultObjectQueueWorker.indexCollection(DefaultObjectQueueWorker.java:73)	at com.atlassian.confluence.search.lucene.DefaultObjectQueueWorker$1.doInTransactionWithoutResult(DefaultObjectQueueWorker.java:61)	at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:33)	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:127)	at com.atlassian.confluence.search.lucene.DefaultObjectQueueWorker.run(DefaultObjectQueueWorker.java:50)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)	at java.lang.Thread.run(Thread.java:595)