undefined method `each' for nil

PubMed:21454543 / 778-785 JSONTXT

Annnotations TAB JSON ListView MergeView

    c_corpus

    {"project":"c_corpus","denotations":[{"id":"T184","span":{"begin":0,"end":7},"obj":"SO:0100018"},{"id":"T185","span":{"begin":0,"end":7},"obj":"SO:0001091"}],"text":"binding"}