JabRef version 5.1 Portable from the

Steps to reproduce the behavior:
- Launch JabRef
- In the lower left corner, in the drop-down menu, select DBLP
- Type in "abelson sussman"
- Select "Structure and Interpretation of Computer Programs" 2nd Edition, 1996
- Click import
The message appears. It is not clear at all what are the "duplicates" in question. Duplicate papers? Duplicate authors in a paper? Is it even connected to the papers I select, or is it something within my bibliography? Additionally, there is no icon anywhere, or at least there is nothing that would be "obviously the icon the message is speaking of".
I am not sure it is related, but for completeness, I am attaching the console log:
Log File
Picked up _JAVA_OPTIONS: -Dsun.java2d.uiScale=1.35 -Dawt.useSystemAAFontSettings=on -Dswing.aatext=true -Dswing.defaultlaf=com.sun.java.swing.plaf.gtk.GTKLookAndFeel -Dswing.crossplatformlaf=com.sun.java.swing.plaf.gtk.GTKLookAndFeel
ERROR StatusLogger Unrecognized format specifier [d]
ERROR StatusLogger Unrecognized conversion specifier [d] starting at position 16 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [thread]
ERROR StatusLogger Unrecognized conversion specifier [thread] starting at position 25 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [level]
ERROR StatusLogger Unrecognized conversion specifier [level] starting at position 35 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [logger]
ERROR StatusLogger Unrecognized conversion specifier [logger] starting at position 47 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [msg]
ERROR StatusLogger Unrecognized conversion specifier [msg] starting at position 54 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [n]
ERROR StatusLogger Unrecognized conversion specifier [n] starting at position 56 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [d]
ERROR StatusLogger Unrecognized conversion specifier [d] starting at position 16 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [thread]
ERROR StatusLogger Unrecognized conversion specifier [thread] starting at position 25 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [level]
ERROR StatusLogger Unrecognized conversion specifier [level] starting at position 35 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [logger]
ERROR StatusLogger Unrecognized conversion specifier [logger] starting at position 47 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [msg]
ERROR StatusLogger Unrecognized conversion specifier [msg] starting at position 54 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [n]
ERROR StatusLogger Unrecognized conversion specifier [n] starting at position 56 in conversion pattern.
(JabRef:11752): Gdk-WARNING **: 17:47:48.377: XSetErrorHandler() called with a GDK error trap pushed. Don't do that.
JabRef version 5.1 Portable from the
Steps to reproduce the behavior:
The message appears. It is not clear at all what are the "duplicates" in question. Duplicate papers? Duplicate authors in a paper? Is it even connected to the papers I select, or is it something within my bibliography? Additionally, there is no icon anywhere, or at least there is nothing that would be "obviously the icon the message is speaking of".
I am not sure it is related, but for completeness, I am attaching the console log:
Log File