Had an identical problem - getting the same error message when trying to make any changes to any of my resources from Active Admin. Strong parameters were correctly entered into the model controller, but only after reviewing the documentation I realized that I needed to include the model attributes that will be added to the model in the / admin / your _model.rb application. As soon as I did this, everything worked correctly from Active Admin.
application / admin / your_model.rb
ActiveAdmin.register Your_model do permit_params :attribute_1, :attribute_2, :attribute_3, :etc, :etc end
This worked on my local server. After pushing the changes to git and deploying to VPS, it worked there too. Make sure you restart the application. In one case, I had to restart my instance. Hope this helps someone.
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