R: Stanford CoreNLP returnning NAs for getSentiment -

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i have following text data:

i prefer old-school guy. have phd degree in science. not interested in finding same background, otherwise life gonna boring.

and trying extract out sentiment scores of above text, nas. 

 dating3 = annotatestring(bio)  bio.emo = getsentiment(dating3)     id sentimentvalue sentiment 1   1             na        na 2   2             na        na 3   3             na        na

i not know why occuring , googled around did not find relevant answers. in meantime, when tried sample data provided within corenlp package 

 getsentiment(annohp)     id sentimentvalue    sentiment 1  1              4 verypositive

it gives me answer, don't know why happening. appreciate if can offer insight.

hopefully have found , else, known bug fixed on github version, see here: https://github.com/statsmaths/corenlp/issues/9


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