Unable to install a plugin
I have Redmine 3.3.3 and I have unziped the plugin Users performance into the redmine plugins directory.
Following the instructions on how to install the plugin:
Update the Gemfile.lock file.
I run the command bundle install but I get the error:
Some gems seem to be missing from your vendor/cache directory.
Could not find json1.8.6 in any of the sources
I installed json version but still getting the same error.
Thanks in advance.