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I believe the issue is that points in your case created as a map, instead of a list. It is a list.

See the documentation for JointTrajectory here:

trajectory_msgs/JointTrajectoryPoint[] points

So in YAML, I would expect this to look something like this:

points : [
  {
     positions : [..],
     velocities : [..],
     accelerations : [..],
     effort : [],
     time_from_start : ...
  },
  {
     positions : [..],
     velocities : [..],
     accelerations : [..],
     effort : [],
     time_from_start : ...
  },
  ...
]

I believe the issue is that points in your case created as a map, instead of a list. It is a list.

See the documentation for JointTrajectory here:

trajectory_msgs/JointTrajectoryPoint[] points

So in YAML, I would expect this to look something like this:

points : [
  {
     positions : [..],
     velocities : [..],
     accelerations : [..],
     effort : [],
[..],
     time_from_start : ...
  },
  {
     positions : [..],
     velocities : [..],
     accelerations : [..],
     effort : [],
[..],
     time_from_start : ...
  },
  ...
]