Error in NPex$data$write("data.csv") after installing Pmetrics

I'm trying to install Pmetrics but I am getting this error: > library(Pmetrics) Welcome to Pmetrics, version 2.1.1. Use PMmanual() or visit the LAPK website at http://www.lapk.org/pmetrics.php for help. Use PM_tutorial() for an introduction. The Pmetrics forum is back! Click the tab at www.lapk.org for questions, tips and bug reports. Follow Pmetrics tweets at https://twitter.com/USCLAPK. CRITICAL: Execute PMbuild() in R to complete Pmetrics installation. > PMbuild() Pmetrics cannot find required compiled binary files. Pmetrics has detected gfortran and will compile required binary files. If the registration time outs, please re-run PMbuild(skipRegistration = TRUE) Pmetrics has anonymously registered your installation of this version. LAPKB does not collect or store any personal or identifying information. Compiling 1 of 9: NPprep... Compiling 2 of 9: NPeng... Compiling 3 of 9: ITprep... Compiling 4 of 9: ITeng... Compiling 5 of 9: ITerr... Compiling 6 of 9: SIMeng... Compiling 7 of 9: DOprep... Compiling 8 of 9: DOeng... Compiling 9 of 9: mb2csv... All packages installed and permanent Fortran modules compiled. > PMtest() Error in NPex$data$write("data.csv") : attempt to apply non-function In addition: Warning message: In data(NPex, package = "Pmetrics", envir = environment()) : data set ‘NPex’ not found Can you help me?