Import update site on Mac 8.5b2 client doesnt work

When I try to import an update site.xml into the update site template for Domino 8.0.1 with the 8.5b2 mac client I get an error as follows:

LS2J Error: Java constructor failed to execute (#304) in:

ls2jclassprogressdialog: cprogressdialog::new (line 33)<----

lsclassimportui: cimportui::importsite (line 110)

dlgimportsite: queryclose (line 13)

Additional Info:

java.lang.NoClassDefFoundError: org/eclipse/swt/widgets/Display

at ProgressDialogUI.createUI(ProgressDialogUI.java:62)

at ProgressDialogUI.run(ProgressDialogUI.java

Subject: Asking dev to look into this <>