Receive Error message when using ggtech theme_tech

After install ggtech and extrafont to R, I receive the following error code when i start to include facebook and twitter theme to my plot. The ggtech theme only works for "Google". Anyone encounter same issue?

Error in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y, :
polygon edge not found

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