Found the following HTML validation problems:
Artifact.html:135:1 (Artifact.Rd:87): Warning: <h5> anchor "Usage" already defined
Artifact.html:151:1 (Artifact.Rd:97): Warning: <h5> anchor "Usage" already defined
Artifact.html:167:1 (Artifact.Rd:107): Warning: <h5> anchor "Usage" already defined
Artifact.html:183:1 (Artifact.Rd:117): Warning: <h5> anchor "Usage" already defined
Artifact.html:199:1 (Artifact.Rd:127): Warning: <h5> anchor "Usage" already defined
Artifact.html:215:1 (Artifact.Rd:137): Warning: <h5> anchor "Usage" already defined
Artifact.html:231:1 (Artifact.Rd:147): Warning: <h5> anchor "Usage" already defined
Artifact.html:247:1 (Artifact.Rd:157): Warning: <h5> anchor "Usage" already defined
Artifact.html:258:1 (Artifact.Rd:166): Warning: <h5> anchor "Arguments" already defined
Artifact.html:291:1 (Artifact.Rd:189): Warning: <h5> anchor "Usage" already defined
Artifact.html:302:1 (Artifact.Rd:198): Warning: <h5> anchor "Arguments" already defined
Artifact.html:333:1 (Artifact.Rd:219): Warning: <h5> anchor "Usage" already defined
Artifact.html:339:1 (Artifact.Rd:223): Warning: <h5> anchor "Arguments" already defined
ArtifactAsset.html:250:1 (ArtifactAsset.Rd:143): Warning: missing </ul> before </div>
ArtifactAsset.html:128:1 (ArtifactAsset.Rd:69): Warning: <h5> anchor "Usage" already defined
ArtifactAsset.html:144:1 (ArtifactAsset.Rd:79): Warning: <h5> anchor "Usage" already defined
ArtifactAsset.html:160:1 (ArtifactAsset.Rd:89): Warning: <h5> anchor "Usage" already defined
ArtifactAsset.html:176:1 (ArtifactAsset.Rd:99): Warning: <h5> anchor "Usage" already defined
ArtifactAsset.html:192:1 (ArtifactAsset.Rd:109): Warning: <h5> anchor "Usage" already defined
ArtifactAsset.html:208:1 (ArtifactAsset.Rd:119): Warning: <h5> anchor "Usage" already defined
ArtifactAsset.html:224:1 (ArtifactAsset.Rd:129): Warning: <h5> anchor "Usage" already defined
ArtifactAsset.html:240:1 (ArtifactAsset.Rd:139): Warning: <h5> anchor "Usage" already defined
Experiment.html:251:1 (Experiment.Rd:159): Warning: <h5> anchor "Usage" already defined
Experiment.html:267:1 (Experiment.Rd:169): Warning: <h5> anchor "Usage" already defined
Experiment.html:283:1 (Experiment.Rd:179): Warning: <h5> anchor "Usage" already defined
Experiment.html:299:1 (Experiment.Rd:189): Warning: <h5> anchor "Usage" already defined
Experiment.html:315:1 (Experiment.Rd:199): Warning: <h5> anchor "Usage" already defined
Experiment.html:331:1 (Experiment.Rd:209): Warning: <h5> anchor "Usage" already defined
Experiment.html:347:1 (Experiment.Rd:219): Warning: <h5> anchor "Usage" already defined
Experiment.html:363:1 (Experiment.Rd:229): Warning: <h5> anchor "Usage" already defined
Experiment.html:379:1 (Experiment.Rd:239): Warning: <h5> anchor "Usage" already defined
Experiment.html:395:1 (Experiment.Rd:249): Warning: <h5> anchor "Usage" already defined
Experiment.html:413:1 (Experiment.Rd:261): Warning: <h5> anchor "Usage" already defined
Experiment.html:419:1 (Experiment.Rd:265): Warning: <h5> anchor "Arguments" already defined
Experiment.html:450:1 (Experiment.Rd:286): Warning: <h5> anchor "Usage" already defined
Experiment.html:456:1 (Experiment.Rd:290): Warning: <h5> anchor "Arguments" already defined
Experiment.html:479:1 (Experiment.Rd:303): Warning: <h5> anchor "Usage" already defined
Experiment.html:495:1 (Experiment.Rd:313): Warning: <h5> anchor "Usage" already defined
Experiment.html:501:1 (Experiment.Rd:317): Warning: <h5> anchor "Arguments" already defined
Experiment.html:524:1 (Experiment.Rd:330): Warning: <h5> anchor "Usage" already defined
Experiment.html:541:1 (Experiment.Rd:341): Warning: <h5> anchor "Usage" already defined
Experiment.html:547:1 (Experiment.Rd:345): Warning: <h5> anchor "Arguments" already defined
Experiment.html:574:1 (Experiment.Rd:362): Warning: <h5> anchor "Usage" already defined
Experiment.html:592:1 (Experiment.Rd:374): Warning: <h5> anchor "Usage" already defined
Experiment.html:598:1 (Experiment.Rd:378): Warning: <h5> anchor "Arguments" already defined
Experiment.html:623:1 (Experiment.Rd:393): Warning: <h5> anchor "Usage" already defined
Experiment.html:639:1 (Experiment.Rd:403): Warning: <h5> anchor "Usage" already defined
Experiment.html:645:1 (Experiment.Rd:407): Warning: <h5> anchor "Arguments" already defined
Experiment.html:668:1 (Experiment.Rd:420): Warning: <h5> anchor "Usage" already defined
Experiment.html:684:1 (Experiment.Rd:430): Warning: <h5> anchor "Usage" already defined
Experiment.html:690:1 (Experiment.Rd:434): Warning: <h5> anchor "Arguments" already defined
Experiment.html:715:1 (Experiment.Rd:449): Warning: <h5> anchor "Usage" already defined
Experiment.html:731:1 (Experiment.Rd:459): Warning: <h5> anchor "Usage" already defined
Experiment.html:745:1 (Experiment.Rd:471): Warning: <h5> anchor "Arguments" already defined
Experiment.html:785:1 (Experiment.Rd:501): Warning: <h5> anchor "Usage" already defined
Experiment.html:798:1 (Experiment.Rd:512): Warning: <h5> anchor "Arguments" already defined
Experiment.html:833:1 (Experiment.Rd:537): Warning: <h5> anchor "Usage" already defined
Experiment.html:839:1 (Experiment.Rd:541): Warning: <h5> anchor "Arguments" already defined
Experiment.html:862:1 (Experiment.Rd:554): Warning: <h5> anchor "Usage" already defined
Experiment.html:868:1 (Experiment.Rd:558): Warning: <h5> anchor "Arguments" already defined
Experiment.html:891:1 (Experiment.Rd:571): Warning: <h5> anchor "Usage" already defined
Experiment.html:897:1 (Experiment.Rd:575): Warning: <h5> anchor "Arguments" already defined
Experiment.html:922:1 (Experiment.Rd:590): Warning: <h5> anchor "Usage" already defined
Experiment.html:934:1 (Experiment.Rd:600): Warning: <h5> anchor "Arguments" already defined
Experiment.html:965:1 (Experiment.Rd:621): Warning: <h5> anchor "Usage" already defined
Experiment.html:981:1 (Experiment.Rd:631): Warning: <h5> anchor "Usage" already defined
Experiment.html:997:1 (Experiment.Rd:641): Warning: <h5> anchor "Usage" already defined
Experiment.html:1015:1 (Experiment.Rd:653): Warning: <h5> anchor "Usage" already defined
Experiment.html:1021:1 (Experiment.Rd:657): Warning: <h5> anchor "Arguments" already defined
Experiment.html:1044:1 (Experiment.Rd:670): Warning: <h5> anchor "Usage" already defined
Experiment.html:1061:1 (Experiment.Rd:681): Warning: <h5> anchor "Usage" already defined
Experiment.html:1083:1 (Experiment.Rd:701): Warning: <h5> anchor "Arguments" already defined
Experiment.html:1136:1 (Experiment.Rd:744): Warning: <h5> anchor "Usage" already defined
Experiment.html:1153:1 (Experiment.Rd:755): Warning: <h5> anchor "Usage" already defined
Experiment.html:1159:1 (Experiment.Rd:759): Warning: <h5> anchor "Arguments" already defined
Experiment.html:1185:1 (Experiment.Rd:775): Warning: <h5> anchor "Usage" already defined
Experiment.html:1195:1 (Experiment.Rd:783): Warning: <h5> anchor "Arguments" already defined
Experiment.html:1245:1 (Experiment.Rd:822): Warning: <h5> anchor "Usage" already defined
Experiment.html:1251:1 (Experiment.Rd:826): Warning: <h5> anchor "Arguments" already defined
Experiment.html:1276:1 (Experiment.Rd:841): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:180:1 (LoggedArtifact.Rd:112): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:196:1 (LoggedArtifact.Rd:122): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:212:1 (LoggedArtifact.Rd:132): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:228:1 (LoggedArtifact.Rd:142): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:244:1 (LoggedArtifact.Rd:152): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:260:1 (LoggedArtifact.Rd:162): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:276:1 (LoggedArtifact.Rd:172): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:292:1 (LoggedArtifact.Rd:182): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:308:1 (LoggedArtifact.Rd:192): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:324:1 (LoggedArtifact.Rd:202): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:340:1 (LoggedArtifact.Rd:212): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:356:1 (LoggedArtifact.Rd:222): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:372:1 (LoggedArtifact.Rd:232): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:378:1 (LoggedArtifact.Rd:236): Warning: <h5> anchor "Arguments" already defined
LoggedArtifact.html:403:1 (LoggedArtifact.Rd:251): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:420:1 (LoggedArtifact.Rd:262): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:436:1 (LoggedArtifact.Rd:272): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:442:1 (LoggedArtifact.Rd:276): Warning: <h5> anchor "Arguments" already defined
LoggedArtifact.html:465:1 (LoggedArtifact.Rd:289): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:471:1 (LoggedArtifact.Rd:293): Warning: <h5> anchor "Arguments" already defined
LoggedArtifact.html:494:1 (LoggedArtifact.Rd:306): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:500:1 (LoggedArtifact.Rd:310): Warning: <h5> anchor "Arguments" already defined
LoggedArtifact.html:524:1 (LoggedArtifact.Rd:324): Warning: <h5> anchor "Usage" already defined
LoggedArtifact.html:530:1 (LoggedArtifact.Rd:328): Warning: <h5> anchor "Arguments" already defined
LoggedArtifactAsset.html:235:1 (LoggedArtifactAsset.Rd:147): Warning: missing </ul> before </div>
LoggedArtifactAsset.html:142:1 (LoggedArtifactAsset.Rd:88): Warning: <h5> anchor "Usage" already defined
LoggedArtifactAsset.html:158:1 (LoggedArtifactAsset.Rd:98): Warning: <h5> anchor "Usage" already defined
LoggedArtifactAsset.html:174:1 (LoggedArtifactAsset.Rd:108): Warning: <h5> anchor "Usage" already defined
LoggedArtifactAsset.html:190:1 (LoggedArtifactAsset.Rd:118): Warning: <h5> anchor "Usage" already defined
LoggedArtifactAsset.html:200:1 (LoggedArtifactAsset.Rd:126): Warning: <h5> anchor "Arguments" already defined