i have this problem for install swirl packeg
I don't really knon why, but i was using R 4.0.0 and it is unstable, not every package is compatible with that architecture
I tried reinstall my R 3.6.3 and every package work smoothly (i'm not guarantee that your problem is with R newest version)
Not sure if it will work, but try to install bitops package and recall the swril pacakge again.
Yes, i uninstall the version 4.0.0, and installed 3.6.2, and everything worked, Thank.
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