[NbConvertApp] Converting notebook hitmapE05.ipynb to html
Traceback (most recent call last):
  File "/opt/anaconda3/lib/python3.8/site-packages/nbformat/reader.py", line 14, in parse_json
    nb_dict = json.loads(s, **kwargs)
  File "/opt/anaconda3/lib/python3.8/json/__init__.py", line 357, in loads
    return _default_decoder.decode(s)
  File "/opt/anaconda3/lib/python3.8/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/opt/anaconda3/lib/python3.8/json/decoder.py", line 353, in raw_decode
    obj, end = self.scan_once(s, idx)
json.decoder.JSONDecodeError: Invalid control character at: line 29 column 6 (char 985)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/opt/anaconda3/bin/jupyter-nbconvert", line 11, in <module>
    sys.exit(main())
  File "/opt/anaconda3/lib/python3.8/site-packages/jupyter_core/application.py", line 270, in launch_instance
    return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
  File "/opt/anaconda3/lib/python3.8/site-packages/traitlets/config/application.py", line 845, in launch_instance
    app.start()
  File "/opt/anaconda3/lib/python3.8/site-packages/nbconvert/nbconvertapp.py", line 350, in start
    self.convert_notebooks()
  File "/opt/anaconda3/lib/python3.8/site-packages/nbconvert/nbconvertapp.py", line 524, in convert_notebooks
    self.convert_single_notebook(notebook_filename)
  File "/opt/anaconda3/lib/python3.8/site-packages/nbconvert/nbconvertapp.py", line 489, in convert_single_notebook
    output, resources = self.export_single_notebook(notebook_filename, resources, input_buffer=input_buffer)
  File "/opt/anaconda3/lib/python3.8/site-packages/nbconvert/nbconvertapp.py", line 418, in export_single_notebook
    output, resources = self.exporter.from_filename(notebook_filename, resources=resources)
  File "/opt/anaconda3/lib/python3.8/site-packages/nbconvert/exporters/exporter.py", line 181, in from_filename
    return self.from_file(f, resources=resources, **kw)
  File "/opt/anaconda3/lib/python3.8/site-packages/nbconvert/exporters/exporter.py", line 199, in from_file
    return self.from_notebook_node(nbformat.read(file_stream, as_version=4), resources=resources, **kw)
  File "/opt/anaconda3/lib/python3.8/site-packages/nbformat/__init__.py", line 143, in read
    return reads(buf, as_version, **kwargs)
  File "/opt/anaconda3/lib/python3.8/site-packages/nbformat/__init__.py", line 73, in reads
    nb = reader.reads(s, **kwargs)
  File "/opt/anaconda3/lib/python3.8/site-packages/nbformat/reader.py", line 58, in reads
    nb_dict = parse_json(s, **kwargs)
  File "/opt/anaconda3/lib/python3.8/site-packages/nbformat/reader.py", line 17, in parse_json
    raise NotJSONError(("Notebook does not appear to be JSON: %r" % s)[:77] + "...") from e
nbformat.reader.NotJSONError: Notebook does not appear to be JSON: '{\n "cells": [\n  {\n   "cell_type": "c...