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

> ### Name: gg_tensor
> ### Title: Plot tensor product effects
> ### Aliases: gg_tensor
> 
> ### ** Examples
> 
> g <- mgcv::gam(Sepal.Length ~ te(Sepal.Width, Petal.Length), data=iris)
> gg_tensor(g)
Warning in graphics::mtext(sprintf("help(\"%s\")", nameEx()), side = 4,  :
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Warning in axis(side = side, at = at, labels = labels, ...) :
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Warning in axis(side = side, at = at, labels = labels, ...) :
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Warning in axis(side = side, at = at, labels = labels, ...) :
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Warning in axis(side = side, at = at, labels = labels, ...) :
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Warning: Removed 647 rows containing non-finite values (stat_contour).
> gg_tensor(g, ci=TRUE)
Warning in graphics::mtext(sprintf("help(\"%s\")", nameEx()), side = 4,  :
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Warning in graphics::mtext(sprintf("help(\"%s\")", nameEx()), side = 4,  :
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Warning in graphics::mtext(sprintf("help(\"%s\")", nameEx()), side = 4,  :
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Warning in strheight(zlab) : no font could be found for family "Arial"
Warning in strwidth(zlab) : no font could be found for family "Arial"
Warning in text.default(xpos + xr/10, ypos, zlab, xpd = TRUE, pos = 4, cex = cs *  :
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Warning in text.default(xpos + xr/10, ypos, zlab, xpd = TRUE, pos = 4, cex = cs *  :
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Error in axis(1, cex.axis = cs * cma) : 
  invalid value specified for graphical parameter "cex.axis"
Calls: gg_tensor ... plot.gam -> plot -> plot.mgcv.smooth -> sp.contour -> axis
Execution halted