Package check result: ERROR

Check: examples, Result: ERROR
  Running examples in ‘graphlayouts-Ex.R’ failed
  The error most likely occurred in:
  
  > base::assign(".ptime", proc.time(), pos = "CheckExEnv")
  > ### Name: layout_backbone
  > ### Title: backbone graph layout
  > ### Aliases: layout_backbone layout_as_backbone layout_igraph_backbone
  > 
  > ### ** Examples
  > 
  > library(igraph)
  
  Attaching package: ‘igraph’
  
  The following objects are masked from ‘package:stats’:
  
      decompose, spectrum
  
  The following object is masked from ‘package:base’:
  
      union
  
  > 
  > g <- sample_islands(9, 20, 0.4, 9)
  > g <- simplify(g)
  > V(g)$grp <- as.character(rep(1:9, each = 20))
  > bb <- layout_as_backbone(g, keep = 0.4)
  Error: oaqc is needed for this function to work. Please install it.
  Execution halted

Check: tests, Result: ERROR
    Running ‘testthat.R’ [3s/3s]
  Running the tests in ‘tests/testthat.R’ failed.
  Complete output:
    > library(testthat)
    > library(graphlayouts)
    > 
    > test_check("graphlayouts")
    [ FAIL 3 | WARN 4 | SKIP 0 | PASS 120 ]
    
    ══ Failed tests ════════════════════════════════════════════════════════════════
    ── Error ('test-layout_backbone.R:2:5'): backbone layout works ─────────────────
    Error: oaqc is needed for this function to work. Please install it.
    Backtrace:
        ▆
     1. └─graphlayouts::layout_as_backbone(igraph::make_full_graph(10)) at test-layout_backbone.R:2:5
    ── Error ('test-layout_multilevel.R:4:5'): layout_mulitlevel works ─────────────
    Error: oaqc is needed for this function to work. Please install it.
    Backtrace:
        ▆
     1. ├─testthat::expect_is(...) at test-layout_multilevel.R:4:5
     2. │ └─testthat::quasi_label(enquo(object), label, arg = "object")
     3. │   └─rlang::eval_bare(expr, quo_get_env(quo))
     4. └─graphlayouts::layout_as_multilevel(...)
     5.   └─graphlayouts (local) FUN1(g1)
    ── Failure ('test-layouts.R:12:3'): igraph function calls work ─────────────────
    Expected `layout_igraph_backbone(g)` to run without any errors.
    ℹ Actually got a <simpleError> with text:
      oaqc is needed for this function to work. Please install it.
    
    [ FAIL 3 | WARN 4 | SKIP 0 | PASS 120 ]
    Error: Test failures
    Execution halted