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Body Context: `rbenv exec bin/dev` failed initially. I ran the command from the wrong directory (`ruby-app-37s` instead of `til_tracker`) and `bin/dev` potentially lacked execute permissions. Resolution: I added execute permissions (`chmod +x til_tracker/bin/dev`), changed to the `til_tracker` directory, and reran `rbenv exec bin/dev`. Learning: I learned to ensure scripts have necessary execute permissions (`+x`) and are executed from the correct working directory relative to the project structure (`pwd`).

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