why did this break?

ERROR:

while parsing a block mapping
  in "<unicode string>", line 120, column 7:
          type: command
          ^
expected <block end>, but found '<block mapping start>'
  in "<unicode string>", line 124, column 8:
           commands:
           ^

ERROR:

while parsing a block mapping
  in "<unicode string>", line 120, column 7:
          type: command
          ^
expected <block end>, but found '<block mapping start>'
  in "<unicode string>", line 124, column 8:
           commands:
           ^