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Revision history [back] isn't working anymore? (R Project)

I am a beginner to Sage but I used to work with R. I know that I can create a R syntax cell by putting %r at the beginning of the cell. But there are a lot of examples which use the syntax (for example: x = r([10.4,5.6,3.1,6.4,21.7]); x). But none of these examples work for me, what am I doing wrong?