Package check result: ERROR

Check: tests, Result: ERROR
    Running ‘testthat.R’ [30s/32s]
  Running the tests in ‘tests/testthat.R’ failed.
  Complete output:
    > 
    > 
    > library(testthat)
    > library(loon)
    Loading required package: tcltk
    loon Version 1.4.2.
    To learn more about loon, see l_web().
    > 
    > test_check("loon")
    
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    [ FAIL 1 | WARN 0 | SKIP 0 | PASS 304 ]
    
    ══ Failed tests ════════════════════════════════════════════════════════════════
    ── Error ('test_loonGrob.R:6:1'): (code run outside of `test_that()`) ──────────
    <packageNotFoundError/error/condition>
    Error in `library(loon.data)`: there is no package called 'loon.data'
    Backtrace:
        ▆
     1. └─base::library(loon.data) at test_loonGrob.R:6:1
    
    [ FAIL 1 | WARN 0 | SKIP 0 | PASS 304 ]
    Error: Test failures
    Execution halted

Check: re-building of vignette outputs, Result: NOTE
  Note: skipping ‘introduction.Rmd’ due to unavailable dependencies: 'maps'
  Note: skipping ‘savingLoonPlots.Rmd’ due to unavailable dependencies: 'png'