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I've been trying to use LAVAAN, which means I need to set up "semPlot" first. However when I try install.packages("semPlot") I receive this message:

Warning in install.packages :
dependency ‘XML’ is not available
also installing the dependencies ‘RcppParallel’, ‘StanHeaders’, ‘rpf’, ‘sem’, ‘OpenMx’
There are binary versions available but the source versions are later:
                binary   source needs_compilation
RcppParallel    5.0.0    5.0.2              TRUE
StanHeaders  2.21.0-1 2.21.0-5              TRUE
rpf             1.0.3    1.0.4              TRUE
sem             3.1-9   3.1-11              TRUE
OpenMx         2.17.3   2.17.4              TRUE

I tried install.packages("XML") but receive package ‘XML’ is not available (for R version 3.5.2) My version is 1.1.463 so I'm not sure what's going on.

When I try to summon library(semPlot) I get this error message:

Error: package or namespace load failed for ‘semPlot’ in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):
 there is no package called ‘sem’

Can anyone help me decipher this riddle? Would be super thankful for any advice!

John Conde
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Steffi Garrett
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    1.1.463 is (I'm guessing) your version of RStudio, which has little to do with the R version itself. If you look at the top of the console, you'll see something like `R version 4.0.2 (2020-06-22) -- "Taking Off Again"` ... you can also use `sessionInfo()` or even `R.version` to see what your current version of R is. FYI, 3.5.2 was [released in Dec 2018](https://cloud.r-project.org/bin/windows/base/old/); you might have a little difficulty installing some packages that now require R-3.6 or R-4.0 to be able to function (though you *might* still be able to install from source). – r2evans Jul 21 '20 at 01:20
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    To install the `XML`package you need to have R ≥ 4.0.0. Update your R software to the latest version. – UseR10085 Jul 21 '20 at 04:37
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    thank you all ! updating my R software fixed the problem!! – Steffi Garrett Jul 21 '20 at 15:10

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