Error while opening

[snagardev]

From X-Plane property screen, when I click on the dataref drop down, I receive the error message:

can't read "all_cmnds": no such variable
can't read "all_cmnds": no such variable
while executing
"lsearch -all -inline $all_cmnds $now"
(procedure "refilter_listbox_cmnd" line 22)
invoked from within
"refilter_listbox_cmnd .xp_view.v0.obj.none.manip.cmnd2 xplane_manip_cmnd20"
("uplevel" body line 1)
invoked from within
"uplevel #0 [$cb cget -postcommand]"
(procedure "ttk::combobox::Post" line 10)
invoked from within
"ttk::combobox::Post .xp_view.v0.obj.none.manip.cmnd2 "
(command bound to event)