Error: 'cars' is not an exported object from 'namespace:openintro'

[hubabe]

I'm trying out the swirl courses with ConoceR by David Duncan and when I click on DATA ANALYSIS, R throws the error Error: 'cars' is not an exported object from 'namespace:openintro'. The following command gives me the result:
getNamespaceExports("openintro")
[1] "normTail" "dlsegments" "myPNG"
[4] "openintro_cols" "contTable" "linResPlot"
[7] "AxisInPercent" "edaPlot" "boxPlot"
[10] "BG" "fadeColor" "write_pkg_data"
[13] "myPDF" "Braces" "CT2DF"
[16] "scale_color_openintro" "lmPlot" "scale_fill_openintro"
[19] "loop" "makeTube" "MosaicPlot"
[22] "buildAxis" "dotPlot" "qqnormsim"
[25] "PlotWLine" "lab_report" "treeDiag"
[28] "CCP" "ArrowLines" "ChiSquareTail"
[31] "densityPlot" "histPlot" "dotPlotStack"
[34] "AxisInDollars" "lsegments" "calc_streak"

Where you can verify that the cars object has not been exported