Many thanks, Andrie.
I find DESCRIOTION doesn't have any line containing 'MD5'. Actuall, it's like this
Title: Tools for the Analysis of Air Pollution Data
Authors@R: c(person("David", "Carslaw", role = c("aut", "cre"), email =
"firstname.lastname@example.org"), person("Karl", "Ropkins", role =
"aut", email = "K.Ropkins@its.leeds.ac.uk"))
Depends: R (>= 3.2.0),
Imports: grid, rlang, dplyr, purrr, tidyr, mgcv, lattice, latticeExtra,
lubridate, cluster, RColorBrewer, mapproj, hexbin, Rcpp,
grDevices, graphics, methods, stats, MASS, utils
Suggests: KernSmooth, maps, mapdata, quantreg
Maintainer: David Carslaw <email@example.com>
Description: Tools to analyse, interpret and understand air
pollution data. Data are typically hourly time series
and both monitoring data and dispersion model output
can be analysed. Many functions can also be applied to
other data, including meteorological and traffic data.
License: GPL (>= 2)
Packaged: 2019-04-08 13:57:29 UTC; davidcarslaw
Author: David Carslaw [aut, cre],
Karl Ropkins [aut]
Date/Publication: 2019-04-08 14:30:04 UTC
and I edit it with notepad++. I'm not sure if I open the file rightfully.
Anyway, there is a file called MD5 which is compressed with all R files and DESCRIPTION. I open it and delete these following two rows
now when I install the package, R would not cast any warnings or errors. It gives information that
package ‘openair’ successfully unpacked and MD5 sums checked
but when I use 'library(openair)' to load this package, R returns:
Error in library(openair) : ‘openair’ is not a valid installed package
I'm so confused, what should I do then?