[R] Error invalid graphics state using text()

[danielw7]

I'm using ssplot for drawing a map of Austria and colour the nine provinces
regarding their share of employment. Now I wanted to add the figures in each
province and failed miserably. Using the locator() and text() function
caused the error message "invalid graphics state". I try to show you what I
have done below, maybe you can find a general fault in my codes. I know that
it's probably not the shortest way to the finishing line, but I'm a starter
and happy about every finish. ;) I'm really hoping for some helpful
comments!

library(maptools)
library(fields)
library(raster)
library(rgdal)
library(RColorBrewer)
library(rgeos)
library(pixmap)
library(classInt)
library(sp)
NUTS2<-readShapePoly("xxx.shp")
shareub2012 <- read.csv("xxx.csv", header=TRUE, sep = ";", dec =
",",stringsAsFactors=F)
mergeshareub2012 <- merge(shareub2012, NUTS2, by.x = "Bundesland", by.y =
"NAME" )
sortmergeshare2012 <- mergeshareub2012[order(mergeshareub2012$ID),]
col_no <- as.factor(as.numeric(cut(sortmergeshare2012$x, c(0, .075, .125,
.25, .50))))
levels(col_no) <- c("< 7,5%", "7,5-12,5%", "12,5-25%","> 25%")
sortmergeshare2012$col_no <- col_no
NUTS2$col_no <- col_no
myPalette<-brewer.pal(4,"Blues")
shareplot2012 <- spplot(NUTS2, "col_no", col="black", col.regions=myPalette,
                    par.settings=list(axis.line=list(col="transparent")))
shareplot2012
plot.new()
locator()
text(0.82421448,0.3897917,"12,41", cex=0.7)



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