Error(s) in re-building vignettes:
  ...
--- re-building ‘correlation-utils.Rmd’ using rmarkdown
--- finished re-building ‘correlation-utils.Rmd’

--- re-building ‘covidcast.Rmd’ using rmarkdown
We encourage COVIDcast API users to register on our mailing list:
https://lists.andrew.cmu.edu/mailman/listinfo/delphi-covidcast-api
We'll send announcements about new data sources, package updates,
server maintenance, and new features.

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

Fetched day 2020-05-01 to 2020-05-01: num_entries = 1
Fetched day 2020-05-01 to 2020-05-01: num_entries = 1
Fetched day 2020-05-01 to 2020-05-01: num_entries = 7
Fetched day 2020-05-01 to 2020-05-07: num_entries = 5
Fetched day 2020-05-03 to 2020-05-03: num_entries = 5
--- finished re-building ‘covidcast.Rmd’

--- re-building ‘external-data.Rmd’ using rmarkdown

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

We encourage COVIDcast API users to register on our mailing list:
https://lists.andrew.cmu.edu/mailman/listinfo/delphi-covidcast-api
We'll send announcements about new data sources, package updates,
server maintenance, and new features.
Fetched day 2020-10-01 to 2020-10-31: num_entries = 1612
--- finished re-building ‘external-data.Rmd’

--- re-building ‘multi-signals.Rmd’ using rmarkdown
We encourage COVIDcast API users to register on our mailing list:
https://lists.andrew.cmu.edu/mailman/listinfo/delphi-covidcast-api
We'll send announcements about new data sources, package updates,
server maintenance, and new features.

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

--- finished re-building ‘multi-signals.Rmd’

--- re-building ‘plotting-signals.Rmd’ using rmarkdown
We encourage COVIDcast API users to register on our mailing list:
https://lists.andrew.cmu.edu/mailman/listinfo/delphi-covidcast-api
We'll send announcements about new data sources, package updates,
server maintenance, and new features.
Quitting from lines 167-177 (plotting-signals.Rmd) 
Error: processing vignette 'plotting-signals.Rmd' failed with diagnostics:
Not Found (HTTP 404). Failed to fetch data from API.
--- failed re-building ‘plotting-signals.Rmd’

SUMMARY: processing the following file failed:
  ‘plotting-signals.Rmd’

Error: Vignette re-building failed.
Execution halted