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The answer to this has very much to do with what exactly you're doing. If you're running a tod_detecting launch file that doesn't run any of your code, then it's almost certainly a bug in tod_detecting.

If you are using tod_detecting inside your own code, you could very well be violating the preconditions for using Eigen types with/inside your classes and functions.

In either case, more information about what you are doing and/or what you don't understand about Eigen is needed to help you.