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I see the same problem reported recently (March 24, 2019). Previously was able to use ggbiplot for prcomp object. Now I get the error shown below:

Here is my code:

> pca<-prcomp(data,center=TRUE,scale=TRUE)

> library(ggbiplot)

> ggbiplot(pca)

get error:

Error in plot_label(p = p, data = plot.data, label = label,
label.label = label.label,  : Unsupported class: prcomp*
Sang won kim
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tom_rwu
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    Can you add details about which version of `ggbiplot` you are using? I cannot confirm the issue with `ggbiplot_0.55`. – Maurits Evers Apr 15 '19 at 04:47
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    The problem was resolved after a fresh download of ggbiplot with updated components. Thank you! – tom_rwu Apr 15 '19 at 13:55

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