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															@@ -285,7 +285,7 @@ def SortBySpec(text): 
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															     for token in text.split(","): 
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															     for token in text.split(","): 
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															         if token not in AI_HUMAN_SORT_KEYS: 
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															         if token not in AI_HUMAN_SORT_KEYS: 
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															-            raise ValueError("Invalid sort key: %s" % token) 
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															+            raise argparse.ArgumentTypeError("Invalid sort key: %s" % token) 
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															     return text.replace("timestamp", "ts") 
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															     return text.replace("timestamp", "ts") 
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