Not able to load any vector files

[ghtmtt]

With all the files I tried (in attach a zip of one simple point layer) I have always this error:

#data preparation
df<-as.data.frame(Layer)
FX<-Layer[[Variable]]

hist(FX)
dev.off()
R execution console output
[1] "/home/matteo/.local/share/QGIS/QGIS3/profiles/tm/processing/rlibs/rgdal"
[1] "/home/matteo/.local/share/QGIS/QGIS3/profiles/tm/processing/rlibs/raster"
Loading required package: sp
rgdal: version: 1.3-6, (SVN revision 773)
Geospatial Data Abstraction Library extensions to R successfully loaded
Loaded GDAL runtime: GDAL 2.3.2, released 2018/09/21
Path to GDAL shared files: /usr/share/gdal
GDAL binary built with GEOS: TRUE
Loaded PROJ.4 runtime: Rel. 5.2.0, September 15th, 2018, [PJ_VERSION: 520]
Path to PROJ.4 shared files: (autodetected)
Linking to sp version: 1.3-1
Error in ogrInfo(dsn = dsn, layer = layer, encoding = encoding, use_iconv = use_iconv, :
Cannot open layer
Calls: readOGR -> suppressMessages -> withCallingHandlers -> ogrInfo
Execution halted

samples.zip

[nyalldawson]

If you run the same script in a standalone r console, does it work? Can you identify what's wrong with the generated script?