\toc error about franklin.jl HOT 7 CLOSED

julia> using Franklin

julia> serve()
  Activating project at `~/Documents/corsi/laboratorio_calcolo/tnds-notebooks`
→ Initial full pass...
┌ Franklin Warning: in <lezione10.md>
│ Encountered an issue processing 'lezione10.md' in lcolo/tnds-notebooks.
│ Verify, then re-start the Franklin server.
│ The error is displayed below:
│ ArgumentError("invalid Array dimensions")
└
ERROR: ArgumentError: invalid Array dimensions
Stacktrace:
  [1] Array
    @ ./boot.jl:477 [inlined]
  [2] Array
    @ ./boot.jl:486 [inlined]
  [3] fill
    @ ./array.jl:532 [inlined]
  [4] fill(v::Nothing, dims::Int64)
    @ Base ./array.jl:530
  [5] hfun_toc(params::Vector{String})
    @ Franklin ~/.julia/packages/Franklin/UskEZ/src/converter/html/functions.jl:244
  [6] top-level scope
    @ none:1
  [7] eval
    @ ./boot.jl:370 [inlined]
  [8] eval
    @ ~/.julia/packages/Franklin/UskEZ/src/Franklin.jl:1 [inlined]
  [9] convert_html_fblock(β::Franklin.HFun)
    @ Franklin ~/.julia/packages/Franklin/UskEZ/src/converter/html/functions.jl:18
 [10] process_html_qblocks(hs::String, qblocks::Vector{Franklin.AbstractBlock}, head::Int64, tail::Int64)
    @ Franklin ~/.julia/packages/Franklin/UskEZ/src/converter/html/html.jl:122
 [11] process_html_qblocks(hs::String, qblocks::Vector{Franklin.AbstractBlock})
    @ Franklin ~/.julia/packages/Franklin/UskEZ/src/converter/html/html.jl:102
 [12] convert_html(hs::String)
    @ Franklin ~/.julia/packages/Franklin/UskEZ/src/converter/html/html.jl:22
 [13] map
    @ ./tuple.jl:275 [inlined]
 [14] map
    @ ./tuple.jl:276 [inlined]
 [15] write_page(output_path::String, content::String; head::String, pgfoot::String, foot::String)
    @ Franklin ~/.julia/packages/Franklin/UskEZ/src/manager/write_page.jl:108
 [16] write_page
    @ ~/.julia/packages/Franklin/UskEZ/src/manager/write_page.jl:75 [inlined]
 [17] convert_and_write(root::String, file::String, head::String, pgfoot::String, foot::String, output_path::String)
    @ Franklin ~/.julia/packages/Franklin/UskEZ/src/manager/write_page.jl:215
 [18] process_file_err(case::Symbol, fpair::Pair{String, String}, head::String, pgfoot::String, foot::String, t::Float64)
    @ Franklin ~/.julia/packages/Franklin/UskEZ/src/manager/file_utils.jl:153
 [19] process_file(::Symbol, ::Pair{String, String}, ::String, ::Vararg{Any})
    @ Franklin ~/.julia/packages/Franklin/UskEZ/src/manager/file_utils.jl:104
 [20] fd_fullpass(watched_files::NamedTuple{(:other, :infra, :md, :html, :literate), NTuple{5, Dict{Pair{String, String}, Float64}}}, join_to_prepath::String)
    @ Franklin ~/.julia/packages/Franklin/UskEZ/src/manager/franklin.jl:265
 [21] serve(; clear::Bool, verb::Bool, port::Int64, single::Bool, prerender::Bool, nomess::Bool, is_final_pass::Bool, no_fail_prerender::Bool, eval_all::Bool, silent::Bool, cleanup::Bool, on_write::Franklin.var"#268#271", log::Bool, host::String, show_warnings::Bool, fail_on_warning::Bool, launch::Bool, no_set_paths::Bool, join_to_prepath::String)
    @ Franklin ~/.julia/packages/Franklin/UskEZ/src/manager/franklin.jl:126
 [22] serve()
    @ Franklin ~/.julia/packages/Franklin/UskEZ/src/manager/franklin.jl:49
 [23] top-level scope
    @ REPL[2]:1