1. In the process of installing the package, what should I do if I encounter the following errors?

Error: package or namespace load failed for ‘scibet’ in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):
 namespace ‘Rcpp’ 0.12.18 is being loaded, but >= 1.0.0 is required

In addition: Warning message:
package ‘scibet’ was built under R version 3.5.1 

In this case, you need to remove the old version package of “Rcpp” and install a new version.