Init error when loading handler

From yesterday evening my Web App in all environments including Production has stopped working.
I haven’t deployed any new changes for the last 10 days.
indent preformatted text by 4 spaces
current versions:
Ruby: 2.5.7
Jets: master branch

Please find the log below:

2020-08-07T00:00:52.110000+00:00 2020/08/06/[$LATEST]d3c351f2ea7442898551867c8d5b7ea8 START RequestId: 2802e899-5331-4f78-88a6-bec6bfc2e8e5 Version: $LATEST 2020-08-07T00:00:52.408000+00:00 2020/08/06/[$LATEST]d3c351f2ea7442898551867c8d5b7ea8 Init error when loading handler handlers/controllers/menus_controller.index 2020-08-07T00:00:52.408000+00:00 2020/08/06/[$LATEST]d3c351f2ea7442898551867c8d5b7ea8 { 2020-08-07T00:00:52.408000+00:00 2020/08/06/[$LATEST]d3c351f2ea7442898551867c8d5b7ea8 “errorMessage”: “You have already activated json 2.3.1, but your Gemfile requires json 2.3.0. Prepending bundle exec to your command may solve this.”, 2020-08-07T00:00:52.408000+00:00 2020/08/06/[$LATEST]d3c351f2ea7442898551867c8d5b7ea8 “errorType”: “InitGem::LoadError”, 2020-08-07T00:00:52.408000+00:00 2020/08/06/[$LATEST]d3c351f2ea7442898551867c8d5b7ea8 “stackTrace”: [ 2020-08-07T00:00:52.408000+00:00 2020/08/06/[$LATEST]d3c351f2ea7442898551867c8d5b7ea8 “/var/runtime/gems/bundler-2.1.4/lib/bundler/runtime.rb:312:in check_for_activated_spec!'", 2020-08-07T00:00:52.408000+00:00 2020/08/06/[$LATEST]d3c351f2ea7442898551867c8d5b7ea8 "/var/runtime/gems/bundler-2.1.4/lib/bundler/runtime.rb:31:inblock in setup’”, 2020-08-07T00:00:52.408000+00:00

Any help in fixing this issue will be very much appreciated.

Thank you in advance.

Wondering if you have another gem that requires json. This will mean the Gemfile.lock has json in it. Would take a look at Gemfile.lock and make sure you remove any gems result in a json dependency. Related:

And:

Think what’s happening is the AWS Lambda Runtime enforces a specific version of JSON and that prevent Ruby from loading. Seems like AWS is rolling out updates to their AWS Lambda on more customer accounts.

That’s disappointing.
I can see a json (2.3.0) dependency in Gemfile.lock file.
Thank you for the quick help.