substr plugin not working I have been using Migrate API as a means to pull in RSS Data as nodes. Currently in Drupal 8 it doesn't seem there is any other reasonable way to do this.

One of my fields is a link that ends in a series of 6 numbers. I need those numbers as an id to go into the url. The substr plugin seems like it would be perfectly suited to accomplish this, but doesn't seem to work at all.

What I have in my YAML file : 

grantid: 
-
  plugin: substr
  source: guid
    start: 61
    length: 6


The error in my drush window when I attempt to even install the module that uses the plugin.

Unable to parse at line 61 (near "  start: 5").' in /var/beetbox/core/lib/Drupal/Core/Config/FileStorage.php:117


Currently I'm looking into using explode, but this is certainly not an ideal solution. Does anyone have some insight on why this plugin wouldn't work? It works fine without using this plugin.

Update : It does seem that was the problem. Thanks for the help.
Answered at https://www.drupal.org/node/2829462 - as mradcliffe says, this is a YAML syntax error.