Have you tried a BUBBLE statement in SGPLOT? https://documentation.sas.com/?docsetId=grstatproc&docsetTarget=n13vtwmd4kzi9jn15mjz9mb46jl5.htm&docsetVersion=9.4&locale=en
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That's not an error, it's a message. It should also tell you the value of T_OS at that line and if you check it, it's likely not valid for the LOG fuction - most likely missing T_OS or overall data.
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