This package comes from: https://brb.nci.nih.gov/BRB-ArrayTools/RPackagesAndManuals/classpredict_0.2.tar.gz
Since shinyapps.io does not support installing packages from private sources, this package has been uploaded to Github for use in shinyapps.io.
To use this package, be sure to download it from the official page of BRB-ArrayTools and use it. There, this package is publicly available. https://brb.nci.nih.gov/BRB-ArrayTools/