Output for data("ex6", package = "ExpDes.pt"):
  Error in namespaceExport(ns, exports) : 
    undefined exports: Adobe_glyphs, HTMLheader, Rcmd, Rdiff, add_datalist, assertCondition, assertError, assertWarning, bibstyle, buildVignette, buildVignettes, charset_to_Unicode, checkMD5sums, checkNEWS, checkPoFile, checkPoFiles, checkRdaFiles, checkVignettes, compactPDF, delimMatch, deparseLatex, dependsOnPkgs, encoded_text_to_latex, file_ext, file_path_as_absolute, file_path_sans_ext, find_gs_cmd, getBibstyle, getVignetteInfo, latexToUtf8, list_files_with_exts, list_files_with_type, makevars_site, makevars_user, nonS3methods, make_translations_pkg, md5sum, package.dependencies, getDepList, pkgDepends, installFoundDepends, vignetteDepends, package_dependencies, package_native_routine_registration_skeleton, parseLatex, parse_Rd, pkgVignettes, pskill, psnice, read.00Index, readNEWS, resaveRdaFiles, showNonASCII, showNonASCIIfile, startDynamicHelp, testInstalledBasic, testInstalledPackage, testInstalledPackages, texi2dvi, texi2pdf, toHTML, toTitleCase, update_pkg_po, vignetteEn
  Calls: ::: ... asNamespace -> getNamespace -> loadNamespace -> namespaceExport
  In addition: Warning message:
  S3 methods ‘[.check_details_changes’, ‘as.character.Rd’, ‘as.matrix.check_url_db’, ‘format.check_compiled_code’, ‘format.check_details’, ‘format.check_details_changes’, ‘format.check_doi_db’, ‘format.check_so_symbols’, ‘format.check_nonAPI_calls’, ‘format.check_RegSym_calls’, ‘format.check_url_db’, ‘format.compactPDF’, ‘format.news_db_from_md’, ‘print.LaTeX’, ‘print.Rd’, ‘print.checkVignettes’, ‘print.xgettext’, ‘print.xngettext’, ‘print.check_demo_index’, ‘print.check_details’, ‘print.check_details_changes’, ‘print.check_doi_db’, ‘print.check_packages_in_dir’, ‘print.check_po_files’, ‘print.check_url_db’, ‘print.check_vignette_index’, ‘summary.check_packages_in_dir’, ‘toHTML.news_db’, ‘toHTML.news_db_from_md’, ‘toHTML.packageIQR’, ‘toHTML.citation’, ‘toRd.bibentry’ were declared in NAMESPACE but not found 
  Execution halted