“-“:1: bad command errors in crontab file, can’t install.

I’m trying to install wp o matic.

Instructions:

Setup

Please follow the next few steps to make sure WP-o-Matic works perfectly for you.

   1.

      First of all, make sure SimplePie, the feed parsing engine that empowers WP-o-Matic is compatible with your server setup.

      To do so, please run this test and evaluate the results. Typically, You have everything you need to run SimplePie properly! Congratulations! is a result you'd be happy with.

      Even though WP-o-Matic is bundled with the latest SimplePie version at the time it was released, we encourage you to install the SimplePie Core WordPress plugin. It is automatically used in place of the bundled version, and it allows you to update SimplePie easily for all the plugins that use it.
   2.

      Timing is a key aspect of this type of feed aggregating software.

      For WP-o-Matic to work properly, you have to make sure server time is accurate, and that the correct timezone is configured here (hint: Date and Time subsection)

      Make sure the following settings are correct:
      UTC time: 13 March, 2010 04:27:54
      Your time: 13 March, 2010 04:27:54

      Do not proceed unless time is configured properly.
   3.

      If you want to go automated, and let WP-o-Matic do the nasty job of pulling rss feeds and creating posts, you need to set up a cron job. For performance reasons, it's highly recommended that you do so, but you can also let WP-o-Matic handle it in browser requests.

      Add this line to your crontab, or use your web panel of choice interface.
      */20 * * * * /usr/bin/curl https://breakingnews.grestestblogsever.com/wp-content/plugins/wp-o-matic/cron.php?code=6cc55106

When I add the line I get this error. Also What should I set the time to ? Thanks

“-“:1: bad command errors in crontab file, can’t install.