XBRL package "Error in fileFromCache(file)"

Question

I'm trying to read this xbrl file with R XBRL package...

https://www.cnmv.es/Portal/Consultas/wuc/DescargaXBRLIPP.ashx?t={77853e69-5deb-4bd5-acd4-3fb4715e2664}

...but when I download the file and run the code

xbrl.vars <- xbrlDoAll(inst, verbose=TRUE)

I get this error:

error in XBRL::xbrlParse(file) :
./ipp-enc-ind-2005-06-30.xsd./ipp-enc-con-2005-06-30.xsd does not exists. Aborting.

I suppose that the error is a problem with the ULR of the .xsd file. Is it possible to download the xsd files in a local directory and use them to read the .XBRL file? How can it be done?