"unused arguments" in R even though all of the arguments are being used?

I'm literally specifying all of the arguments explicitly for this function (https://rdrr.io/bioc/coRdon/man/codonUsage.html).

What could be happening in R? The error is not very informative on what's happening since I'm using all of the arguments available.

Unused argument in R suggested I remove the variable but that didn't help.

Here's my code:

# Command line options
opts = parser$parse_args()


# Get function
cu_func = eval(parse(text=opts$method))

# Read in sequences
coding_sequences = readSet(file=opts$coding_sequences)
reference_sequences = readSet(file=opts$reference_sequences)

# Create codon table objects
cT_coding = codonTable(x=coding_sequences)
cT_reference = codonTable(x=reference_sequences)

# Subset
subset = list(reference=cT_reference)
names(subset) = c(opts$reference_name)

# Compute codon usage bias
df_codon_usage_bias = cu_func(
    cTobject=cT_coding,
    subsets=subset,
    self=TRUE,
    id_or_name2=opts$genetic_code,
    ribosomal=FALSE,
    alt.init=opts$use_alternative_start_codons,
    stop.rm=opts$remove_stop_codons,
    filtering="hard",
    len.threshold=opts$length_threshold
)

Here's my very uninformative error:

Error in cu_func(cTobject = cT_coding, subsets = subset, self = TRUE,  :
  unused arguments (cTobject = cT_coding, subsets = subset, self = TRUE, id_or_name2 = opts$genetic_code, ribosomal = FALSE, alt.init = opts$use_alternative_start_codons, stop.rm = opts$remove_stop_codons, filtering = "hard", len.threshold = opts$length_threshold)
Execution halted