Fetching gem metadata from https://rubygems.org/.........
Resolving dependencies.......
Bundler could not find compatible versions for gem "deface":
In snapshot (Gemfile.lock):
deface (= 1.6.2)
In Gemfile:
deface (= 1.6.2)
redmine_plugin_kit was resolved to 1.0.1, which depends on
deface (= 1.8.1)
looks like another plugin use different deface version. Same as in #102. Remove other plugin or change it to use same deface version as redmine_plugin_kit (which uses redmine_messenger)