[bugfix] fix f-string for error (#9295)

Signed-off-by: Prashant Gupta <prashantgupta@us.ibm.com>

Author: prashantgupta24

vllm/transformers_utils/tokenizers/mistral.py

@@ -30,12 +30,12 @@ def find_tokenizer_file(files: List[str]):
     matched_files = [file for file in files if file_pattern.match(file)]
     if len(matched_files) > 1:
         raise OSError(f"Found {len(matched_files)} files matching the "
-                      "pattern: {matched_files}. Make sure only one Mistral "
-                      "tokenizer is present in {tokenizer_name}.")
+                      f"pattern: {file_pattern}. Make sure only one Mistral "
+                      f"tokenizer is present in {files}.")
     elif len(matched_files) == 0:
         raise OSError(f"Found {len(matched_files)} files matching the "
-                      "pattern: {matched_files}. Make sure that a Mistral "
-                      "tokenizer is present in {tokenizer_name}.")
+                      f"pattern: {file_pattern}. Make sure that a Mistral "
+                      f"tokenizer is present in {files}.")
 
     return matched_files[0]