Thank you for answering.
I will present the information.
Machine is Azure VM, OS is Windows Server 2016 Datacenter.
Installer is Bitnami Redmin Stack (redmine-3.3.3-1) (introduced by hand)
Plugins are ZIP (redmine_backlogs- master.zip) downloaded from below.
The current situation is as follows.
C:\Bitnami\redmine-3.3.3-1\apps\redmine\htdocs\plugins>bundle exec rake db:migrate
Warning: this Gemfile contains multiple primary sources. Using
source more than once without a block is a security risk, and may result in installing unexpected gems. To resolve this warning, use a block to indicate which gems should come from the secondary source. To upgrade this warning to an error, run
bundle config disable_multisource true.
You cannot specify the same gem twice with different version requirements.
You specified: simplecov (~> 0.9.1) and simplecov (~> 0.6)
*** LOCAL GEMS ***
json (2.1.0, 1.8.3)
rake (12.0.0, 10.4.2)
If you check Gemfile,
gem "simplecov", "~> 0.9.1"
gem "simplecov", "~>0.6"
However, "simplecov" is not a bundle installed gem.
What should I do now?