r - ggplot2，ggridges，-x 中的错误：一元运算符的参数无效

Question

我正在尝试从 ggridges 包中绘制一个joyplot图（随时间变化的密度分布）。文件“Dados empilhados”是一个汇集数据集。

library(ggridges)
library(ggplot2)    
library(XLConnect)

data = loadWorkbook('Dados empilhados.xls')

data = readWorksheet(data, sheet = 'Sheet1', header = T)
ggplot(data[data$Time>0,], aes(x = betas.dyn, y = Time, group = Time)) +
  geom_density_ridges(scale = 10, size = 0.25, rel_min_height = 0.03) +
  theme_ridges() +
  scale_x_continuous(limits=c(0.0, 1.3), expand = c(0.01, 0)) +
  scale_y_reverse(breaks=c(2016, 2012, 2008, 2004, 2001), expand = c(0.01, 0))

但我收到以下错误：

Error in -x : invalid argument to unary operator

Obs.: 达多斯 empilhados:

Time      Country    betas    betas.dyn  
2001-Q1   Angola     10.02    12.23
2001-Q2   Angola     14.53    13.45
2001-Q3   Angola     13.32    11.74
   .         .         .        .
   .         .         .        .
   .         .         .        .