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This error indicates that a Rope action verb has been passed an unexpected set of arguments - either in terms of their number and/or types.
In order to verify the expected number and types of arguments, first identify the action that reported the error, and then check it's manual page on this site (see LanguageReference) to determine whether brackets should be used or not, and if so: how many arguments (and what types) should be placed between them.
Remember that an action does not know how many arguments you pass to it unless you put them in a bracketed list (see AnchorBrackets).
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