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Instead of trying to solve your issue directly, I suggest you to take a look at other threads where some of them seem to handle exactly the same error messages.

Instead of trying to solve your issue directly, I suggest you to take a look at other threads where some of them seem to handle exactly the same error messages.

UPDATE) Not sure from the limited provided information, but you might have forgotten to run source devel/setup.bash.

If this works, I suggest you review the earlier tutorials; usage of source command is covered earlier.

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