I'm trying to do what I think should be simple - e.g. extract the names of the sequences from an AAbin object. I had working code for a DNAbin object that looks like

seq_data <- fasta2DNAbin(all_files[i])
names <- dimnames(seq_data)

The corresponding code for an AAbin object

seq_data <- ape::read.FASTA(all_files[i], type = "AA")
names <- dimnames(seq_data)

produces a null variable "names". What is the correct way to get the list of names from an AAbin file?

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The ape package is from CRAN, not Bioconductor. If you want help with CRAN packages you can try r-help@r-project.org, or possibly biostrings.com