package swirl not working

I am just wondering what happened to the package swirl? It just gives me aborts my RStudio sessions whenever I chose some courses. For example, here I was loading the course Graphics Devices in R. However, it gave the following and it aborts my session
Graphics_Devices_in_R. (Slides for this and other Data Science courses may be found at github If you care to use them, they must be downloaded as a zip file and viewed locally. This lesson corresponds to 04_ExploratoryAnalysis/Graphics_Devices_in_R.)

The error was here
Error in (function (srcref) : unimplemented type (29) in 'eval'


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