Error(s) in re-building vignettes:
  ...
duplicated vignette title:
  ‘Retrieving and Analyzing PubMed Records via easyPubMed’

--- re-building ‘easyPM_vignette_html.Rmd’ using rmarkdown
Warning in grep("\\\n$", msg) :
  input string 1 is invalid in this locale
Quitting from lines 39-50 (easyPM_vignette_html.Rmd) 
Error: processing vignette 'easyPM_vignette_html.Rmd' failed with diagnostics:
1: Input is not proper UTF-8, indicate encoding !
Bytes: 0xD5 0x78 0xEA 0x50
2: expected '>'
3: Opening and ending tag mismatch: DescriptorName line 2529 and D0<d5>x<ea>PV
4: Opening and ending tag mismatch: MeshHeading line 2528 and Hour
5: Opening and ending tag mismatch: MeshHeadingList line 2472 and PubMedPubDate
6: Opening and ending tag mismatch: MedlineCitation line 2291 and History
7: Opening and ending tag mismatch: PubmedArticle line 2290 and PubmedData
8: Opening and ending tag mismatch: PubmedArticleSet line 3 and PubmedArticle
9: Extra content at the end of the document

--- failed re-building ‘easyPM_vignette_html.Rmd’

--- re-building ‘easyPM_vignette_pdf.Rmd’ using rmarkdown
Quitting from lines 39-50 (easyPM_vignette_pdf.Rmd) 
Error: processing vignette 'easyPM_vignette_pdf.Rmd' failed with diagnostics:
1: Opening and ending tag mismatch: ArticleIdList line 2071 and Abstract
2: Specification mandate value for attribute ValiId
3: Opening and ending tag mismatch: Author line 2091 and ArticleIdList
4: Opening and ending tag mismatch: AuthorList line 2074 and Reference
5: expected '>'
6: Opening and ending tag mismatch: ReferenceList line 1918 and PubmedData
7: Opening and ending tag mismatch: PubmedData line 1871 and PubmedArticle
8: Opening and ending tag mismatch: ArticleDate line 2410 and ArticleDaa
9: Opening and ending tag mismatch: Article line 2292 and MedlineJournalInfo
10: Opening and ending tag mismatch: ArticleTitle line 2767 and Abstract
11: expected '>'
12: Opening and ending tag mismatch: AffiliationInfo line 2774 and Affiliatifor
13: Opening and ending tag mismatch: Author line 2770 and AbstractText
14: Opening and ending tag mismatch: AuthorList line 2769 and Abstract
15: Input is not proper UTF-8, indicate encoding !
Bytes: 0xA0 0x5D 0x83 0x02
16: PCDATA invalid Char value 2
17: PCDATA invalid Char value 29
18: Opening and ending tag mismatch: ArticleIdList line 5496 and Reference
19: Opening and ending tag mismatch: ArticleId line 5527 and Reference
20: Opening and ending tag mismatch: ArticleIdList line 5526 and ReferenceList
21: Opening and ending tag mismatch: Reference line 5524 and PubmedData
22: Opening and ending tag mismatch: Reference line 5494 and PubmedArticle
23: expected '>'
24: Opening and ending tag mismatch: ArticleId line 6896 and ArticlIMCFlA2zs6SFz7JsDoeA3raAVGI
25: PCDATA invalid Char value 16
26: Opening and ending tag mismatch: ArticleIdList line 6895 and Reference
27: expected '>'
28: Opening and ending tag mismatch: ReferenceList line 6796 and PubmedData
29: Opening and ending tag mismatch: PubmedData line 6764 and PubmedArticle
30: expected '>'
31: Premature end of data in tag ReferenceList line 5481
32: Premature end of data in tag PubmedData line 5450
33: Premature end of data in tag PubmedArticle line 5257
34: Premature end of data in tag PubmedArticle line 1589
35: Premature end of data in tag PubmedArticleSet line 3

--- failed re-building ‘easyPM_vignette_pdf.Rmd’

SUMMARY: processing the following files failed:
  ‘easyPM_vignette_html.Rmd’ ‘easyPM_vignette_pdf.Rmd’

Error: Vignette re-building failed.
Error: Duplicate vignette titles.
  Ensure that the %\VignetteIndexEntry lines in the vignette sources
  correspond to the vignette titles.
Execution halted