Bug: plot.fasta()

Got following errors when run R CMD check on feature_pdb_dataframe:

* checking examples ... ERROR
Running examples in ‘bio3d-Ex.R’ failed
The error most likely occurred in:

> ### Name: plot.fasta
> ### Title: Plot a Multiple Sequence Alignment
> ### Aliases: plot.fasta
> ### Keywords: hplot
> 
> ### ** Examples
> 
> # Read alignment
> aln<-read.fasta(system.file("examples/kif1a.fa",package="bio3d"))
> 
> ## alignment plot
> plot(aln)
Error in plot.fasta(aln) : 
  input 'x' should be a list object as obtained from 'read.fasta'
Calls: plot -> plot.fasta
Execution halted

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