I get an error when trying to load ChAMP data. It says 'directory' for loading does not exist, does anyone know why I get this error? The IdatFiles folder actually does exist.

dir.create("RAW")
getGEOSuppFiles("GSE117852", makeDirectory = TRUE, baseDir =  './RAW')
untar('./RAW/GSE117852/GSE117852_RAW.tar', exdir = './RAW/GSE117852/IdatFiles')

#put PD file in IdatFiles folder

dir.create("01_preprocessing")
filesGSE117852<-'./RAW/GSE117852/IdatFiles/'
set.seed(11)
myloadGSE117852 <- champ.load(directory = filesGSE117852,
                              method="ChAMP",
                              methValue="B",
                              autoimpute=TRUE,
                              filterDetP=TRUE,
                              ProbeCutoff=0,
                              SampleCutoff=0.1,
                              detPcut=0.01,
                              filterBeads=TRUE,
                              beadCutoff=0.05,
                              filterNoCG=TRUE,
                              filterSNPs=TRUE,
                              population=NULL,
                              filterMultiHit=TRUE,
                              filterXY=TRUE, # not default
                              force=FALSE,
                              arraytype="450K")

[===========================]
[<<<< ChAMP.LOAD START >>>>>]
-----------------------------

[ Loading Data with ChAMP Method ]
----------------------------------
Note that ChAMP method will NOT return rgSet or mset, they object defined by minfi. Which means, if you use ChAMP method to load data, you can not use SWAN or FunctionNormliazation method in champ.norm() (you can use BMIQ or PBC still). But All other function should not be influenced.

[===========================]
[<<<< ChAMP.IMPORT START >>>>>]
-----------------------------

[ Section 1: Read PD Files Start ]
Error in champ.import(directory, arraytype = arraytype) : 
    Your 'directory' for loading does not exists, please assign a correct directory.