loadNamespace出错，找不到包

Question

我开始使用R.当我尝试加载包Rcmdr时，会出现此错误

Loading required package: RcmdrMisc

Loading required package: car

Error in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]) : 
  there is no package called ‘nloptr’

Error: package ‘car’ could not be loaded

请帮助我，我需要这个课程在大学上课。