Running examples in 'RStoolbox-Ex.R' failed
The error most likely occurred in:

> ### Name: readEE
> ### Title: Tidy import tool for EarthExplorer .csv export files
> ### Aliases: readEE
> 
> ### ** Examples
> 
> library(ggplot2)
> ee <- readEE(system.file("external/EarthExplorer_LS8.txt", package = "RStoolbox"))
> 
> ## Scenes with cloud cover < 20%
> ee[ee$Cloud.Cover < 20,]
   Landsat.Scene.Identifier WRS.Path WRS.Row Data.Category Cloud.Cover
6     LC82240632015157LGN00      224      63       NOMINAL       13.20
27    LC82240632014186LGN00      224      63       NOMINAL       15.94
40    LC82240632013327LGN00      224      63       NOMINAL       13.19
46    LC82240632013215LGN00      224      63       NOMINAL       14.72
49    LC82240632013167LGN00      224      63       NOMINAL        6.35
   Station.Identifier Day.Night Data.Type.Level.1 Date.Acquired Sun.Elevation
6                 LGN       DAY               L1T    2015/06/06      51.98871
27                LGN       DAY               L1T    2014/07/05      51.01591
40                LGN       DAY              L1GT    2013/11/23      61.83434
46                LGN       DAY               L1T    2013/08/03      54.43226
49                LGN       DAY               L1T    2013/06/16      51.64735
   Sun.Azimuth Geometric.RMSE.Model.X Geometric.RMSE.Model.Y
6     43.59274                  6.244                  5.663
27    44.79093                  5.452                  5.420
40   126.95937                  0.000                  0.000
46    51.68815                  5.631                  5.840
49    42.59918                  6.377                  5.862
              Display.ID           Ordering.ID
6  LC82240632015157LGN00 LC82240632015157LGN00
27 LC82240632014186LGN00 LC82240632014186LGN00
40 LC82240632013327LGN00 LC82240632013327LGN00
46 LC82240632013215LGN00 LC82240632013215LGN00
49 LC82240632013167LGN00 LC82240632013167LGN00
                                                               Download.Link
6  http://earthexplorer.usgs.gov/download/options/4923/LC82240632015157LGN00
27 http://earthexplorer.usgs.gov/download/options/4923/LC82240632014186LGN00
40 http://earthexplorer.usgs.gov/download/options/4923/LC82240632013327LGN00
46 http://earthexplorer.usgs.gov/download/options/4923/LC82240632013215LGN00
49 http://earthexplorer.usgs.gov/download/options/4923/LC82240632013167LGN00
   Browse.Link       Date Doy Year Satellite Num
6           NA 2015-06-06 157 2015       LS8   8
27          NA 2014-07-05 186 2014       LS8   8
40          NA 2013-11-23 327 2013       LS8   8
46          NA 2013-08-03 215 2013       LS8   8
49          NA 2013-06-16 167 2013       LS8   8
> 
> ## Available time-series
> ggplot(ee) + 
+ 		geom_segment(aes(x = Date, xend = Date, y = 0, yend = 100 - Cloud.Cover, 
+      col = as.factor(Year))) +
+ 		scale_y_continuous(name = "Scene quality (% clear sky)")
Error: Columns `x`, `xend` are dates/times and must be stored as POSIXct, not POSIXlt
Execution halted