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: 0xC1 0xD3 0x05 0x0A
2: expected '>'
3: Opening and ending tag mismatch: Reference line 999 and Refe0<c1><d3>
4: PCDATA invalid Char value 5
5: Opening and ending tag mismatch: ReferenceList line 740 and Author
6: Opening and ending tag mismatch: AffiliationInfo line 1026 and Reference
7: Opening and ending tag mismatch: Author line 1022 and ReferenceList
8: Opening and ending tag mismatch: ArticleIdList line 1331 and Reference
9: expected '>'
10: Opening and ending tag mismatch: ReferenceList line 1280 and PubmedData
11: Opening and ending tag mismatch: PubmedData line 1239 and PubmedArticle
12: Opening and ending tag mismatch: AffiliationInfo line 1659 and Author
13: Opening and ending tag mismatch: Affiliation line 1683 and Author
14: Opening and ending tag mismatch: AffiliationInfo line 1682 and AuthorList
15: Opening and ending tag mismatch: Author line 1678 and Article
16: Opening and ending tag mismatch: Author line 1655 and MedlineCitation
17: Opening and ending tag mismatch: AuthorList line 1602 and PubmedArticle
18: StartTag: invalid element name
19: Opening and ending tag mismatch: Country line 2375 and GrantList
20: Opening and ending tag mismatch: Grant line 2371 and Article
21: Opening and ending tag mismatch: GrantList line 2370 and MedlineCitation
22: Opening and ending tag mismatch: Article line 2289 and PubmedArticle
23: Opening and ending tag mismatch: Citation line 3686 and Reference
24: expected '>'
25: Opening and ending tag mismatch: ReferenceList line 3678 and PubmedData
26: Opening and ending tag mismatch: PubmedData line 3647 and PubmedArticle
27: expected '>'
28: Premature end of data in tag MedlineCitation line 2277
29: Premature end of data in tag PubmedArticle line 2276
30: Premature end of data in tag Article line 1580
31: Premature end of data in tag MedlineCitation line 1573
32: Premature end of data in tag PubmedArticle line 1572
33: Premature end of data in tag PubmedArticle line 1091
34: Premature end of data in tag PubmedArticleSet line 3

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

--- re-building ‘easyPM_vignette_pdf.Rmd’ using rmarkdown
Warning in grep("\\\n$", msg) :
  input string 1 is invalid in this locale
Quitting from lines 39-50 (easyPM_vignette_pdf.Rmd) 
Error: processing vignette 'easyPM_vignette_pdf.Rmd' failed with diagnostics:
1: Input is not proper UTF-8, indicate encoding !
Bytes: 0xC0 0x36 0x9D 0x05
2: error parsing attribute name
3: attributes construct error
4: Couldn't find end of Start Tag Re<c0>6 line 957
5: PCDATA invalid Char value 5
6: Opening and ending tag mismatch: ReferenceList line 740 and AffiliationInfo
7: Opening and ending tag mismatch: PubmedData line 698 and Author
8: Opening and ending tag mismatch: Affiliation line 979 and Reference
9: Opening and ending tag mismatch: AffiliationInfo line 978 and ReferenceList
10: Opening and ending tag mismatch: Author line 974 and PubmedData
11: PCDATA invalid Char value 5
12: PCDATA invalid Char value 31
13: PCDATA invalid Char value 12
14: PCDATA invalid Char value 17
15: PCDATA invalid Char value 12
16: PCDATA invalid Char value 19
17: StartTag: invalid element name
18: PCDATA invalid Char value 18
19: PCDATA invalid Char value 18
20: PCDATA invalid Char value 17
21: PCDATA invalid Char value 23
22: PCDATA invalid Char value 21
23: PCDATA invalid Char value 28
24: xmlParseEntityRef: no name
25: PCDATA invalid Char value 29
26: PCDATA invalid Char value 11
27: PCDATA invalid Char value 27
28: PCDATA invalid Char value 25
29: PCDATA invalid Char value 14
30: PCDATA invalid Char value 1
31: PCDATA invalid Char value 26
32: PCDATA invalid Char value 7
33: expected '>'
34: Opening and ending tag mismatch: AffiliationInfo line 1606 and Author
35: expected '>'
36: Opening and ending tag mismatch: AuthorList line 1601 and Article
37: Opening and ending tag mismatch: Article line 1579 and MedlineCitation
38: Opening and ending tag mismatch: MedlineCitation line 1572 and PubmedArticle
39: PCDATA invalid Char value 20
40: Opening and ending tag mismatch: AbstractText line 2288 and Abstract
41: Opening and ending tag mismatch: Abstract line 2287 and Article
42: Opening and ending tag mismatch: Article line 2267 and MedlineCitation
43: Opening and ending tag mismatch: MedlineCitation line 2255 and PubmedArticle
44: error parsing attribute name
45: attributes construct error
46: Couldn't find end of Start Tag QualifierN line 3577
47: expected '>'
48: Opening and ending tag mismatch: MeshHeadingList line 3564 and MedlineCitation
49: Opening and ending tag mismatch: MedlineCitation line 3367 and PubmedArticle
50: expected '>'
51: Premature end of data in tag PubmedArticle line 2254
52: Premature end of data in tag PubmedArticle line 1571
53: 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