Error(s) in re-building vignettes:
  ...
--- re-building ‘intro_to_fishflux.Rmd’ using rmarkdown
Importing /tmp/check-CRAN-regular-hornik/data/R/rfishbase/popgrowth_fb_2104.tsv.bz2 in 1000000 line chunks:
Rows: 11901 Columns: 79
── Column specification ────────────────────────────────────────────────────────
Delimiter: "\t"
chr  (22): AutoCtr, E_CODE, Sex, Data, r2, LCL_Loo, AssumedDistLoo, AssumedD...
dbl  (50): StockCode, SpecCode, PopGrowthRef, DataSourceRef, Loo, Number, SE...
lgl   (4): SE_M, SD_M, AssumedDistM, TS
dttm  (3): DateEntered, DateModified, DateChecked

ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.
	...Done! (in 3.503677 secs)
Failed to connect to www.fishbase.se port 443 after 35 ms: Connection refused
Importing /tmp/check-CRAN-regular-hornik/data/R/rfishbase/ecology_fb_2104.tsv.bz2 in 1000000 line chunks:
Rows: 12208 Columns: 142
── Column specification ────────────────────────────────────────────────────────
Delimiter: "\t"
chr  (48): autoctr, Intertidal, SubLittoral, Bathypelagic, Abyssopelagic, He...
dbl  (93): SpecCode, StockCode, EcologyRefNo, HabitatsRef, Neritic, SupraLit...
dttm  (1): Datechecked

ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.
	...Done! (in 6.043933 secs)
Importing /tmp/check-CRAN-regular-hornik/data/R/rfishbase/morphmet_fb_2104.tsv.bz2 in 1000000 line chunks:
Rows: 13308 Columns: 56
── Column specification ────────────────────────────────────────────────────────
Delimiter: "\t"
chr   (4): autoctr, PicName, SL, Remarks
dbl  (48): Speccode, TL, FL, HL, PAL, PDL, PPL, PPEL, ED, POL, BD, CH, CA, S...
lgl   (2): DateChecked, TS
dttm  (2): DateEntered, DateModified

ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.
	...Done! (in 3.084204 secs)
average values for b0 and alpha used
Quitting from lines 213-216 (intro_to_fishflux.Rmd) 
Error: processing vignette ‘intro_to_fishflux.Rmd’ failed with diagnostics:
arguments imply differing number of rows: 1, 0
--- failed re-building ‘intro_to_fishflux.Rmd’

SUMMARY: processing the following file failed:
  ‘intro_to_fishflux.Rmd’

Error: Vignette re-building failed.
Execution halted