Error in swirlExpectation(condit

error in swirlExpectation(condition(object)) :

could not find function "is_equivalent_to"

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I didn't realize that you were using R Programming Alt.
Unfortunately R Programming Alt is no longer supported.
Please use R Programming instead.

说是R Programming Alt已经不再支持了，
所以我们在导入swirl的课程时不要选 R Programming Alt，
换成R Programming 就ok了.