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That error on Test Now means you've already bootstrapped it from a mechanic - once you use a mechanic, you need to use the "quick reload data files" option from the Develop menu (keyboard shortcut ctrl-r), and can no longer use Test Now, because Test Now can't handle modifying things like mechanics that are en-massed to a character, and modifying a spell bootstrapped by a mechanic counts as modifying the mechanic - it's a change to the database of available content for your character that can't be made while the database is in use.
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