suprafiles.net plugin error

suprafiles.net plugin error
note: sometimes it works...
sample: [suprafiles.net]

log:

Sun Jul 16 00:02:00 CEST 2017 WARNING: SlimerJS not found
Sun Jul 16 00:02:08 CEST 2017 WARNING: File name was not found in attachment
Sun Jul 16 00:02:15 CEST 2017 WARNING: No Content-Disposition (filename) header in file
Sun Jul 16 00:02:15 CEST 2017 WARNING: Loading file failed
Sun Jul 16 00:02:15 CEST 2017 WARNING: Downloading using download link cache failed
Sun Jul 16 00:02:15 CEST 2017 SEVERE:
cz.vity.freerapid.plugins.exceptions.ServiceConnectionProblemException: Error starting download
at cz.vity.freerapid.plugins.services.xfilesharing.XFileSharingRunner.doDownload(Unknown Source)
at cz.vity.freerapid.plugins.services.xfilesharing.XFileSharingRunner.handleDownloadFromCache(Unknown Source)
at cz.vity.freerapid.plugins.services.xfilesharing.XFileSharingRunner.run(Unknown Source)
at cz.vity.freerapid.plugins.webclient.AbstractFileShareService.run(AbstractFileShareService.java:102)
at cz.vity.freerapid.core.tasks.DownloadTask.doInBackground(DownloadTask.java:98)
at cz.vity.freerapid.core.tasks.DownloadTask.doInBackground(DownloadTask.java:42)
at javax.swing.SwingWorker$1.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at javax.swing.SwingWorker.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Sun Jul 16 00:02:15 CEST 2017 WARNING: No Content-Disposition (filename) header in file
Sun Jul 16 00:02:15 CEST 2017 WARNING: Loading file failed