Running examples in ‘ggspectra-Ex.R’ failed
The error most likely occurred in:

> ### Name: scale_x_wavenumber_continuous
> ### Title: Wavenumber x-scale
> ### Aliases: scale_x_wavenumber_continuous
> 
> ### ** Examples
> 
> 
> ggplot(sun.spct, aes(x = wl2wavenumber(w.length), y = s.e.irrad)) +
+   geom_line() +
+   scale_x_wavenumber_continuous()
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  font metrics unknown for Unicode character U+03bc
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  font metrics unknown for Unicode character U+03bc
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  font metrics unknown for Unicode character U+03bc
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  font metrics unknown for Unicode character U+03bc
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  font metrics unknown for Unicode character U+03bc
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  font metrics unknown for Unicode character U+03bc
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  font metrics unknown for Unicode character U+03bc
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  font metrics unknown for Unicode character U+03bc
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  font metrics unknown for Unicode character U+03bc
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  font metrics unknown for Unicode character U+03bc
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  font metrics unknown for Unicode character U+03bc
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  font metrics unknown for Unicode character U+03bc
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  font metrics unknown for Unicode character U+03bc
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  font metrics unknown for Unicode character U+03bc
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  font metrics unknown for Unicode character U+03bc
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  font metrics unknown for Unicode character U+03bc
Error in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  : 
  conversion failure on 'μ' in 'mbcsToSbcs': for μ
Calls: <Anonymous> ... drawDetails -> drawDetails.text -> grid.Call.graphics
Execution halted