title: Error using Tax4Fun2 (R package) with runRefBlast() function
body: <p>I am trying the next code in R (with Tax4Fun2-R package), but always I get the next ERROR when I put  runRefBlast() function:</p>
  <p>(base) juanm@juanm-Compaq-CQ58-Notebook-PC:~$ export PATH=$PATH:/media/juanm/d631a66f-81da-495d-8136-67bc214cb51d2/Tax4Fun2/R/Tax4Fun2_ReferenceData_v2/blast_bin/bin/</p>
  <p>(base) juanm@juanm-Compaq-CQ58-Notebook-PC:~$ R</p>
  <p>PATH = &quot;media/juanm/d631a66f-81da-495d-8136-67bc214cb51d2/Tax4Fun2/R/Tax4Fun2_ReferenceData_v2/blast_bin/bin/&quot;</p>
  <p>runRefBlast(path_to_otus = &quot;media/juanm/d631a66f-81da-495d-8136-67bc214cb51d2/Tax4Fun2/R/fasta&quot;,
  path_to_reference_data = PATH,
  path_to_temp_folder = &quot;media/juanm/d631a66f-81da-495d-8136-67bc214cb51d2/Tax4Fun2/R/Ref100NR&quot;,
  database_mode = &quot;Ref100NR&quot;,
  use_force = T, num_threads = 4)</p>
  <p>chmod: can't access to '/home/juanm/d631a66f-81da-495d-8136-67bc214cb51d2/Tax4Fun2/R/Tax4Fun2_ReferenceData_v2//blast_bin/bin/blastn': It doesn't exist the file or directory
  sh: 1: /home/juanm/d631a66f-81da-495d-8136-67bc214cb51d2/Tax4Fun2/R/Tax4Fun2_ReferenceData_v2//blast_bin/bin/blastn: not found
  <strong>Error in system(command = paste(blast_bin, &quot;-help&quot;), intern = T) :
  error in running command</strong></p>
  <blockquote>
  </blockquote>
  <p>But all these folders and files have root permissions.And also I have tried it using nautilus, but the error is the same.</p>
  <p>Please, could you help me to solve this error if you know how?.</p>
  <p>I use Ubuntu 16.0 and R 4.1.1.</p>
  <p>Thank you very much</p>