Update vllm/sampling_params.py

Co-authored-by: Nick Hill <nhill@redhat.com>
Signed-off-by: Alex-Brooks <Alex.Brooks@ibm.com>

Author: alex-jw-brooks

vllm/sampling_params.py

@@ -386,7 +386,7 @@ def _verify_args(self) -> None:
             raise ValueError("frequency_penalty must be in [-2, 2], got "
                              f"{self.frequency_penalty}.")
         if not self.repetition_penalty > 0.0:
-            raise ValueError("repetition_penalty must be non-negative, got "
+            raise ValueError("repetition_penalty must be greater than zero, got "
                              f"{self.repetition_penalty}.")
         if self.temperature < 0.0:
             raise ValueError(