Thanks, @gueyenono ! I've tried your method, but still error report when I library semPlot:
Error: package or namespace load failed for ‘semPlot’:
.onLoad failed in loadNamespace() for 'OpenMx', details:
call: fun(libname, pkgname)
error: function 'Rcpp_precious_remove' not provided by package 'Rcpp'
Any other suggestions? Thank you very much!