DSpace 6.3
Ubuntu 18.04

I just imported 1440 items to my database, using SimplaArchiveFormat. This 
all seemed to work fine and the new items can be searched and viewed. The 
image bitstreams will display fine, when viewed.
I can't create thumbnails! I even attempted create a single thumbnail with 
/dspace/bin/dspace filter-media -i 123456789/3787

Shouldn't this work immediately after import? The command "free -m" tells 
me two thirds of my system memory is still available. 

root@melo3:~# /dspace/bin/dspace filter-media -i 123456789/3587
File: E-Wells-Co-7-11-2018.679.jpg.jpg
!!! OutOfMemoryError !!!
FILTERED: bitstream d95f9b7f-7484-4287-93cd-379dcddce34c (item: 
123456789/3587) and created 'E-Wells-Co-7-11-2018.679.jpg.jpg'
File: E-Wells-Co-7-11-2018.679.jpg.jpg
ERROR filtering, skipping bitstream #d95f9b7f-7484-4287-93cd-379dcddce34c 
java.io.IOException: Error: Header doesn't contain versioninfo
java.io.IOException: Error: Header doesn't contain versioninfo
        at org.apache.pdfbox.pdfparser.PDFParser.parse(PDFParser.java:244)
        at org.apache.pdfbox.pdmodel.PDDocument.load(PDDocument.java:966)
        at org.apache.pdfbox.pdmodel.PDDocument.load(PDDocument.java:868)
        at 
org.dspace.app.mediafilter.PDFBoxThumbnail.getDestinationStream(PDFBoxThumbnail.java:80)
        at 
org.dspace.app.mediafilter.MediaFilterServiceImpl.processBitstream(MediaFilterServiceImpl.java:361)
        at 
org.dspace.app.mediafilter.MediaFilterServiceImpl.filterBitstream(MediaFilterServiceImpl.java:287)
        at 
org.dspace.app.mediafilter.MediaFilterServiceImpl.filterItem(MediaFilterServiceImpl.java:181)
        at 
org.dspace.app.mediafilter.MediaFilterServiceImpl.applyFiltersItem(MediaFilterServiceImpl.java:159)
        at 
org.dspace.app.mediafilter.MediaFilterCLITool.main(MediaFilterCLITool.java:315)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.dspace.app.launcher.ScriptLauncher.runOneCommand(ScriptLauncher.java:229)
        at 
org.dspace.app.launcher.ScriptLauncher.main(ScriptLauncher.java:81)
root@melo3:~#

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