Package check result: ERROR

Check: examples, Result: ERROR
  Running examples in ‘manynet-Ex.R’ failed
  The error most likely occurred in:
  
  > base::assign(".ptime", proc.time(), pos = "CheckExEnv")
  > ### Name: make_play
  > ### Title: Making diffusion models on networks
  > ### Aliases: make_play play_diffusion play_diffusions
  > 
  > ### ** Examples
  > 
  >   smeg <- generate_smallworld(15, 0.025)
  >   plot(play_diffusion(smeg, recovery = 0.4))
  >   #graphr(play_diffusion(ison_karateka))
  >   plot(play_diffusions(smeg, times = 10))
  Error in loadNamespace(x) : there is no package called ‘future’
  Calls: plot ... loadNamespace -> withRestarts -> withOneRestart -> doWithOneRestart
  Execution halted

Check: tests, Result: ERROR
    Running ‘testthat.R’ [15s/8s]
  Running the tests in ‘tests/testthat.R’ failed.
  Complete output:
    > library(testthat)
    > library(manynet)
    > 
    > test_check("manynet")
    Starting 2 test processes
    [ FAIL 4 | WARN 0 | SKIP 21 | PASS 546 ]
    
    ══ Skipped tests (21) ══════════════════════════════════════════════════════════
    • On CRAN (21): 'test-manip_as.R:86:3', 'test-manip_split.R:49:3',
      'test-map_autographr.R:2:3', 'test-map_autographr.R:17:3',
      'test-map_autographr.R:31:3', 'test-map_autographr.R:47:3',
      'test-map_autographr.R:65:3', 'test-map_autographr.R:90:3',
      'test-map_autographr.R:102:3', 'test-map_autographr.R:111:3',
      'test-map_autographr.R:117:3', 'test-map_autographr.R:124:3',
      'test-map_autographr.R:137:3', 'test-map_autographr.R:154:3',
      'test-map_autographr.R:167:3', 'test-map_autographr.R:176:3',
      'test-mark_nodes.R:13:3', 'test-mark_nodes.R:22:3', 'test-mark_nodes.R:62:3',
      'test-mark_ties.R:24:3', 'test-mark_ties.R:33:3'
    
    ══ Failed tests ════════════════════════════════════════════════════════════════
    ── Error ('test-make_read.R:4:3'): read_edgelist works ─────────────────────────
    <packageNotFoundError/error/condition>
    Error in `loadNamespace(x)`: there is no package called 'readxl'
    Backtrace:
        ▆
     1. ├─testthat::expect_equal(...) at test-make_read.R:4:3
     2. │ └─testthat::quasi_label(enquo(object), label, arg = "object")
     3. │   └─rlang::eval_bare(expr, quo_get_env(quo))
     4. ├─manynet::read_edgelist(testthat::test_path("sheets", "test.xlsx"))
     5. └─base::loadNamespace(x)
     6.   └─base::withRestarts(stop(cond), retry_loadNamespace = function() NULL)
     7.     └─base (local) withOneRestart(expr, restarts[[1L]])
     8.       └─base (local) doWithOneRestart(return(expr), restart)
    ── Error ('test-make_read.R:43:3'): read_nodelist works ────────────────────────
    <packageNotFoundError/error/condition>
    Error in `loadNamespace(x)`: there is no package called 'readxl'
    Backtrace:
        ▆
     1. ├─testthat::expect_equal(...) at test-make_read.R:43:3
     2. │ └─testthat::quasi_label(enquo(object), label, arg = "object")
     3. │   └─rlang::eval_bare(expr, quo_get_env(quo))
     4. ├─manynet::read_nodelist(testthat::test_path("sheets", "test.xlsx"))
     5. └─base::loadNamespace(x)
     6.   └─base::withRestarts(stop(cond), retry_loadNamespace = function() NULL)
     7.     └─base (local) withOneRestart(expr, restarts[[1L]])
     8.       └─base (local) doWithOneRestart(return(expr), restart)
    ── Error ('test-member_equivalence.R:5:3'): equivalence clustering returns the right class ──
    <packageNotFoundError/error/condition>
    Error in `loadNamespace(x)`: there is no package called 'sna'
    Backtrace:
         ▆
      1. ├─testthat::expect_s3_class(...) at test-member_equivalence.R:5:3
      2. │ └─testthat::quasi_label(enquo(object), arg = "object")
      3. │   └─rlang::eval_bare(expr, quo_get_env(quo))
      4. ├─manynet::node_in_structural(ison_adolescents, "elbow", "hier")
      5. │ └─manynet::node_in_equivalence(...)
      6. │   └─manynet::k_elbow(hc, .data, census, range)
      7. └─base::loadNamespace(x)
      8.   └─base::withRestarts(stop(cond), retry_loadNamespace = function() NULL)
      9.     └─base (local) withOneRestart(expr, restarts[[1L]])
     10.       └─base (local) doWithOneRestart(return(expr), restart)
    ── Error ('test-member_equivalence.R:18:3'): equivalence clustering works ──────
    <packageNotFoundError/error/condition>
    Error in `loadNamespace(x)`: there is no package called 'sna'
    Backtrace:
         ▆
      1. ├─testthat::expect_equal(...) at test-member_equivalence.R:18:3
      2. │ └─testthat::quasi_label(enquo(expected), expected.label, arg = "expected")
      3. │   └─rlang::eval_bare(expr, quo_get_env(quo))
      4. ├─manynet::node_in_regular(ison_adolescents, "elbow")
      5. │ └─manynet::node_in_equivalence(...)
      6. │   └─manynet::k_elbow(hc, .data, census, range)
      7. └─base::loadNamespace(x)
      8.   └─base::withRestarts(stop(cond), retry_loadNamespace = function() NULL)
      9.     └─base (local) withOneRestart(expr, restarts[[1L]])
     10.       └─base (local) doWithOneRestart(return(expr), restart)
    
    [ FAIL 4 | WARN 0 | SKIP 21 | PASS 546 ]
    Error: Test failures
    Execution halted