Deprecation warnings in log

[scarroll32]

Am seeing these messages

DEPRECATION WARNING: input_class is deprecated and will be removed from Formtastic 4.0 (configure Formtastic::FormBuilder.input_class_finder instead (upgrade guide on wiki: http://bit.ly/1F9QtKc )) (called from block (2 levels) in ___sers_sean__rbenv_versions_______lib_ruby_gems_______bundler_gems_active_admin_import___cee_c______app_views_admin_import_html_erb___4445657620281541259_70188441734960 at /Users/sean/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/bundler/gems/active_admin_import-07cee9c11638/app/views/admin/import.html.erb:6)