使用Tidyr单独将一列分为两部分会返回以下错误：
df <- data.frame(ID=11:13, FOO=c('a|b', 'b|c', 'x|y'))
tidyr::separate(data = df, col = FOO, into = c("left", "right"), sep =
"\\|")
simplePieces（pieces，n，fill ==“ left”）中的错误： 找不到对象“ _tidyr_simplifyPieces”
关于为什么发生这种情况的任何建议？
Session Info:
R version 3.5.1 (2018-07-02)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: OS X El Capitan 10.11.6
Matrix products: default
BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.5/Resources/lib/libRlapack.dylib
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] grid stats graphics grDevices utils datasets methods base
other attached packages:
[1] zeallot_0.1.0 fANCOVA_0.5-1 survival_2.42-3
[4] lubridate_1.7.4 lmPerm_2.1.0 gridExtra_2.3
[7] PerformanceAnalytics_1.5.2 xts_0.10-2 RColorBrewer_1.1-2
[10] kableExtra_0.9.0 zoo_1.8-1 caTools_1.17.1
[13] randomForest_4.6-14 scales_1.0.0 factoextra_1.0.5
[16] ggplot2_3.0.0 psych_1.8.4 data.table_1.11.2
[19] reshape2_1.4.3 car_3.0-0 carData_3.0-1
[22] raster_2.6-7 sp_1.2-7 dplyr_0.7.5
[25] tidyr_0.8.1