The editor fails to run

[andy5995]

When I built in an Ubuntu 22.04 docker container, I got the error:

root@7092a54b049f:/flexlay-netpanzer-map-editor/netpanzer# ./netpanzer-editor
/flexlay-netpanzer-map-editor/ruby/flexlay.rb:262: warning: assigned but unused variable - label
/flexlay-netpanzer-map-editor/ruby/flexlay.rb:236: warning: assigned but unused variable - window
/flexlay-netpanzer-map-editor/ruby/flexlay.rb:237: warning: assigned but unused variable - items
/flexlay-netpanzer-map-editor/ruby/flexlay.rb:238: warning: assigned but unused variable - ok
/flexlay-netpanzer-map-editor/ruby/flexlay.rb:239: warning: assigned but unused variable - cancel
/flexlay-netpanzer-map-editor/ruby/flexlay.rb:240: warning: assigned but unused variable - callback
Traceback (most recent call last):
	2: from ./netpanzer.rb:29:in `<main>'
	1: from /usr/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:92:in `require'
/usr/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:92:in `require': cannot load such file -- netpanzer_wrap (LoadError)