Why were the Shakira and Jason Aldean shows at Fenway Park canceled?

Fans were left disappointed after Shakira’s concert at Boston’s Fenway Park was canceled last-minute, along with the Jason Aldean and Brooks & Dunn show scheduled for the following day. Live Nation cited “unforeseen circumstances” for the cancellations and promised refunds for ticket holders. The Boston Globe reported a problem with the stage as the reason for the cancellations.