Exception when trying to install Add-on

[WetHat]

When installing the add/on a the Freeplane Automatic Bug Report dialog is displayed with following

at 2017-09-30 12:16:56 CMT, hash 4a6ceb114bde4240db3183a258e55d2f
previous report : at 2017-07-06 13:43:14 CMT, hash ff74687b37f7b4e9c34aae5f219a20c3
freeplane_version = 1.6.7; freeplane_xml_version = freeplane 1.6.0
git revision = a51dc03bcd0dc661aace9bfb7f83e7f66eccc133 Dimitry Polivaev 2017-09-23T14:40:22Z
java_version = 1.8.0_131; os_name = Windows 10; os_version = 10.0
missing key Import OPML to selected node

[chraxo]

I have observed the same issue, however neverthless the plugin seems to work properly.