Package check result: ERROR

Check: examples, Result: ERROR
  Running examples in ‘redatam-Ex.R’ failed
  The error most likely occurred in:
  
  > base::assign(".ptime", proc.time(), pos = "CheckExEnv")
  > ### Name: read_redatam
  > ### Title: Read REDATAM dictionary
  > ### Aliases: read_redatam
  > 
  > ### ** Examples
  > 
  > # Read a dictionary file (Galapagos 2015)
  > zip <- system.file("extdata", "galapagos.zip", package = "redatam")
  > dout <- paste(tempdir(), "galapagos", sep = "/")
  > unzip(zip, exdir = dout)
  > read_redatam(paste(dout, "cg15.dic", sep = "/"))
  Opening dictionary file...
  Error in export_redatam_to_list_(dictionary) : 
    attempt to set an attribute on NULL
  Calls: read_redatam -> export_redatam_to_list_
  Execution halted

Check: tests, Result: ERROR
    Running ‘testthat.R’ [3s/3s]
  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(redatam)
    > 
    > test_check("redatam")
    Opening dictionary file...
    [ FAIL 1 | WARN 0 | SKIP 0 | PASS 0 ]
    
    ══ Failed tests ════════════════════════════════════════════════════════════════
    ── Error ('test-galapagos.R:35:3'): reading works ──────────────────────────────
    Error in `export_redatam_to_list_(dictionary)`: attempt to set an attribute on NULL
    Backtrace:
        ▆
     1. └─redatam::read_redatam(dic) at test-galapagos.R:35:3
     2.   └─redatam:::export_redatam_to_list_(dictionary)
    
    [ FAIL 1 | WARN 0 | SKIP 0 | PASS 0 ]
    Error: Test failures
    Execution halted