Could not upload annotations for the CVAT for video format

[azhavoro]

My actions before raising this issue

• Read/searched the docs
• Searched past issues

Expected Behaviour

The annotation file is uploaded sucessfully.

Current Behaviour

Server exception

Possible Solution

Steps to Reproduce (for bugs)

1. Create multi-job task
2. Try to upload annotations.zip

Context

Your Environment

• Git hash commit (git log -1):
• Docker version docker version (e.g. Docker 17.0.05): 19.03.08
• Are you using Docker Swarm or Kubernetes?
• Operating System and version (e.g. Linux, Windows, MacOS): Ubuntu 19
• Code example or link to GitHub repo or gist to reproduce problem:
• Other diagnostic information / logs:
  Logs from `cvat` container

Traceback (most recent call last):
  File "/usr/local/lib/python3.5/dist-packages/rq/worker.py", line 812, in perform_job
    rv = job.perform()
  File "/usr/local/lib/python3.5/dist-packages/rq/job.py", line 588, in perform
    self._result = self._execute()
  File "/usr/local/lib/python3.5/dist-packages/rq/job.py", line 594, in _execute
    return self.func(*self.args, **self.kwargs)
  File "/usr/lib/python3.5/contextlib.py", line 30, in inner
    return func(*args, **kwds)
  File "/home/django/cvat/apps/dataset_manager/task.py", line 741, in import_job_annotations
    job.import_annotations(f, importer)
  File "/home/django/cvat/apps/dataset_manager/task.py", line 546, in import_annotations
    self.create(task_data.data.slice(self.start_frame, self.stop_frame).serialize())
  File "/home/django/cvat/apps/dataset_manager/annotation.py", line 126, in slice
    for t in self.tracks if self._is_track_inside(t, start, stop)]
  File "/home/django/cvat/apps/dataset_manager/annotation.py", line 126, in <listcomp>
    for t in self.tracks if self._is_track_inside(t, start, stop)]
  File "/home/django/cvat/apps/dataset_manager/annotation.py", line 99, in _slice_track
    track, start, stop)
  File "/home/django/cvat/apps/dataset_manager/annotation.py", line 739, in get_interpolated_shapes
    shapes.extend(interpolate(prev_shape, shape))
  File "/home/django/cvat/apps/dataset_manager/annotation.py", line 715, in interpolate
    shapes = simple_interpolation(shape0, shape1)
  File "/home/django/cvat/apps/dataset_manager/annotation.py", line 456, in simple_interpolation
    diff = np.subtract(shape1["points"], shape0["points"])
numpy.core._exceptions.UFuncTypeError: ufunc 'subtract' did not contain a loop with signature matching types (dtype('<U6'), dtype('<U6')) -> dtype('<U6')

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