Package check result: ERROR

Check: examples, Result: ERROR
  Running examples in ‘OmopSketch-Ex.R’ failed
  The error most likely occurred in:
  
  > base::assign(".ptime", proc.time(), pos = "CheckExEnv")
  > ### Name: tableOmopSnapshot
  > ### Title: Create a visual table from a summarise_omop_snapshot result.
  > ### Aliases: tableOmopSnapshot
  > 
  > ### ** Examples
  > 
  > cdm <- mockOmopSketch(numberIndividuals = 10)
  > 
  > result <- summariseOmopSnapshot(cdm)
  > 
  > result |>
  +   tableOmopSnapshot()
  ! Results have not been suppressed.
  Error in loadNamespace(x) : there is no package called ‘gt’
  Calls: tableOmopSnapshot ... loadNamespace -> withRestarts -> withOneRestart -> doWithOneRestart
  Execution halted
  Examples with CPU (user + system) or elapsed time > 5s
                         user system elapsed
  mockOmopSketch        6.230  0.340   6.615
  summariseOmopSnapshot 4.982  0.201   5.032

Check: tests, Result: ERROR
    Running ‘testthat.R’ [128s/66s]
  Running the tests in ‘tests/testthat.R’ failed.
  Complete output:
    > # This file is part of the standard setup for testthat.
    > # It is recommended that you do not modify it.
    > #
    > # Where should you do additional test configuration?
    > # Learn more about the roles of various files in:
    > # * https://r-pkgs.org/testing-design.html#sec-tests-files-overview
    > # * https://testthat.r-lib.org/articles/special-files.html
    > 
    > library(testthat)
    > library(OmopSketch)
    > 
    > test_check("OmopSketch")
    Starting 2 test processes
    [ FAIL 6 | WARN 1 | SKIP 20 | PASS 91 ]
    
    ══ Skipped tests (20) ══════════════════════════════════════════════════════════
    • On CRAN (20): 'test-plotInObservation.R:2:3', 'test-mockOmopSketch.R:2:3',
      'test-summariseClinicalRecords.R:2:3',
      'test-summariseClinicalRecords.R:81:3',
      'test-summariseClinicalRecords.R:226:3', 'test-summariseInObservation.R:2:3',
      'test-summariseInObservation.R:96:3', 'test-summariseInObservation.R:148:3',
      'test-summariseInObservation.R:186:3', 'test-summariseConceptCounts.R:2:3',
      'test-summariseConceptCounts.R:428:3', 'test-summariseOmopSnapshot.R:2:3',
      'test-summariseOmopSnapshot.R:10:3',
      'test-summarisePopulationCharacteristics.R:2:3',
      'test-summarisePopulationCharacteristics.R:150:3',
      'test-summarisePopulationCharacteristics.R:166:3',
      'test-summariseRecordCount.R:2:3', 'test-summariseRecordCount.R:92:3',
      'test-summariseRecordCount.R:112:3', 'test-summariseRecordCount.R:191:3'
    
    ══ Failed tests ════════════════════════════════════════════════════════════════
    ── Failure ('test-summariseOmopSnapshot.R:28:3'): works with mockOmopSketch ────
    Expected `x <- tableOmopSnapshot(summariseOmopSnapshot(cdm))` to run without any errors.
    i Actually got a <packageNotFoundError> with text:
      there is no package called 'gt'
    ── Error ('test-summariseOmopSnapshot.R:29:3'): works with mockOmopSketch ──────
    Error in `eval(code, test_env)`: object 'x' not found
    Backtrace:
        ▆
     1. ├─testthat::expect_true(inherits(x, "gt_tbl")) at test-summariseOmopSnapshot.R:29:3
     2. │ └─testthat::quasi_label(enquo(object), label, arg = "object")
     3. │   └─rlang::eval_bare(expr, quo_get_env(quo))
     4. └─base::inherits(x, "gt_tbl")
    ── Failure ('test-summariseObservationPeriod.R:164:3'): check summariseObservationPeriod works ──
    Expected `tableObservationPeriod(resAll)` to run without any errors.
    i Actually got a <packageNotFoundError> with text:
      there is no package called 'gt'
    ── Failure ('test-summariseObservationPeriod.R:165:3'): check summariseObservationPeriod works ──
    Expected `tableObservationPeriod(resOne)` to run without any errors.
    i Actually got a <packageNotFoundError> with text:
      there is no package called 'gt'
    ── Failure ('test-summariseObservationPeriod.R:166:3'): check summariseObservationPeriod works ──
    Expected `tableObservationPeriod(resEmpty)` to run without any errors.
    i Actually got a <packageNotFoundError> with text:
      there is no package called 'gt'
    ── Failure ('test-summariseObservationPeriod.R:323:3'): check it works with mockOmopSketch ──
    Expected `tableObservationPeriod(sop)` to run without any errors.
    i Actually got a <packageNotFoundError> with text:
      there is no package called 'gt'
    
    [ FAIL 6 | WARN 1 | SKIP 20 | PASS 91 ]
    Error: Test failures
    Execution halted