title: Error in match(x, table, nomatch = 0L) : 'match' requires vector arguments
body: <p>I am trying to do some Bioconductor exercises on R studio cloud. Running the first two codes (#1,#2) have been fine, but the last code(#3) gives the error message. Please can anyone help?</p>
  
  <pre><code>#1 Transcribe dna_seq into an RNAString object and print it
   dna_seq &lt;- subseq(unlist(zikaVirus), end = 21)
   dna_seq
    21-letter "DNAString" instance
  seq: AGTTGTTGATCTGTGTGAGTC
  
  
  
  #2 Transcribe dna_seq into an RNAString object and print it
   rna_seq &lt;- RNAString(dna_seq) 
   rna_seq
    21-letter "RNAString" instance
  seq: AGUUGUUGAUCUGUGUGAGUC
  
  #3 Translate rna_seq into an AAString object and print it
  aa_seq &lt;- translate(rna_seq)
  aa_seq
  
   aa_seq &lt;- translate(rna_seq)
  </code></pre>
  
  <blockquote>
    <p>Error in match(x, table, nomatch = 0L) : 
      'match' requires vector arguments
    aa_seq
    Error: object 'aa_seq' not found</p>
  </blockquote>