If you get this error, you will want to check whether or not you have a solution activated on both the Farm level and Site Collection level. For example, under Central Administration > System Settings > Manage Farm Solutions, you might have a Solution.WSP file deployed to your web apps. Then under your site collection where you’re trying to manage your workflows, go under Site Settings > Galleries > Solutions and make sure the same Solution.wsp file is not activated there. It’s okay to have it deployed on the farm level but having the same solution activated on the Site Collection level will cause errors with your workflows.
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