用USB——Blaster下载时出现的错误 window, word

lg5836

File G/study/Altera/Hello_time_limited.sof contains one or more time-limited magafunctions that support the OpenCore Plus feature that will not word after the hardware evaluation time expries. Refer to the messages window for evaluation time details.

这什么意思啊，怎么改啊，下载的时候出现的这个问题。开发板是DE2