Does it tested with Ruby < '2.6'?
I got the following exception:
/usr/lib/ruby/2.5.0/psych/nodes/node.rb:49:in `to_ruby': Cannot load database configuration: (ArgumentError)
wrong number of arguments (given 1, expected 0)
and this change fixes error:
Index: Gemfile
<+>UTF-8
===================================================================
diff --git a/Gemfile b/Gemfile
--- a/Gemfile
+++ b/Gemfile
@@ -25,7 +25,7 @@
gem "rbpdf", "~> 1.20.0"
gem 'addressable'
gem 'rubyzip', '~> 2.3.0'
-gem 'psych', '~> 3.1' if Gem.ruby_version < Gem::Version.new('2.6.0')
+gem 'psych', '~> 3.1.0' if Gem.ruby_version < Gem::Version.new('2.6.0')
Env:
ruby 2.5.0
redmine: 4.2.8