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Replace the generic except Exception block with a custom AutomataError class that inherits from Exception. This provides more precise exception handling for automata parsing and validation errors while avoiding overly broad exception catches that could mask programming errors like SyntaxError or TypeError. The AutomataError class is raised when DOT file processing fails due to invalid format, I/O errors, or malformed automaton definitions. The main entry point catches this specific exception and provides a user-friendly error message to stderr before exiting. Also, replace generic exceptions raising in HA and LTL with AutomataError. Co-authored-by: Gabriele Monaco <gmonaco@redhat.com> Signed-off-by: Wander Lairson Costa <wander@redhat.com> Reviewed-by: Gabriele Monaco <gmonaco@redhat.com> Link: https://lore.kernel.org/r/20260223162407.147003-2-wander@redhat.com Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>