title: What to do when the terminal displays "Sorry, could not find a PTY"? (Mac OSx)
body: <p>I'm connecting an android device to an FTDI, which is connected to my Mac. On my android device I'm using FTDI AOA HyperTerm. I can send chars without any problem to my mac using this program: <a href="https://www.decisivetactics.com/products/serial/" rel="noreferrer">https://www.decisivetactics.com/products/serial/</a>. As you can see I can only use it for 7 days, so I want to use my Terminal instead.
  When I run this command:</p>
  
  <pre><code>screen /dev/tty.usbserial 9600
  </code></pre>
  
  <p>I get a blank screen with two messages, the second one being "Sorry, could not find a PTY".</p>
  
  <p>What should I do to fix this?</p>
  
  <p>EDIT: when I closed the Serial program, it worked on my Terminal. However, when I restart my Terminal it gives the same message.
  I open Serial, select my USB device, close serial and use my Terminal. 
  Why is this?</p>