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java.util.zip.ZipException: data error	at java.util.zip.ZipInputStream.read(ZipInputStream.java:343)	at org.digitalcampus.mobile.learning.utils.FileUtils.unzipFiles(FileUtils.java:118)	at org.digitalcampus.mobile.learning.task.InstallDownloadedModulesTask.doInBackground(InstallDownloadedModulesTask.java:68)	at org.digitalcampus.mobile.learning.task.InstallDownloadedModulesTask.doInBackground(InstallDownloadedModulesTask.java:1)	at android.os.AsyncTask$2.call(AsyncTask.java:185)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)	at java.util.concurrent.FutureTask.run(FutureTask.java:138)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)