Hi
If this is still an issue, then as well as what @Tom has said (which I think is the most likely cause), please share the log by using the Insert Code icon "</>" as there might be other clues as to why it "all of sudden no longer work".
Also, if you haven't already, check to see if the library has allocated successfully. The message you have reported might have always been in your log when you previously ran the code.
Lastly, in answer to your question "What does this mean?": a quoted string immediately followed by an identifier can give the string a special meaning, e.g., '09may2025'd is a way of specifying a date value, by using "d" immediately after the quoted date text. So SAS is displaying this note (not error or warning) message to inform you of potential future SAS changes that might cause the quoted string to have new meaning, based on the identifier that immediately follows it. Hence the recommendation of using a space after the closing quote.
HTH.
Thanks & kind regards,
Amir.
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