DataTable error: Invalid argument `fixed_columns` passed into DataTable

I get this error:

Invalid argument `fixed_columns` passed into DataTable with ID "sys_table".
Value provided: 
[
  {
    "headers": true,
    "data": 1
  }
]

With this code:

    table = dash_table.DataTable(
        id=table_name,
        columns=[{"name": name, "id": col} for name, col in zip(headers,
                                                               df_columns)],
        fixed_rows = {'headers': True, 'data': 0},
        fixed_columns = {'headers': True, 'data': 1},
        data=df.to_dict('records'),
        fill_width=True,
        row_selectable=row_selectable,
        filter_action="native",
        sort_action="native",
        sort_mode="multi",
        style_cell_conditional=[{"if": {"column_id": "Specs"},
                                 "textAlign": "left"}],
        style_table={'overflowX': 'scroll', 'maxHeight': '600px',
                     'maxWidth': '1500px', 'overflowY': 'scroll'},
        style_cell={"padding": '0 2rem', 'border': 'none', 'minWidth': '200px',
                    'width': 'auto', 'height': 'auto', 'whiteSpace': 'normal'},
        style_header={'font_size': '20px', 'text_align': 'left',
                      'backgroundColor': colors['table_header_background'],
                      'color': colors['bright_text'], 'fontWeight': 'bold'},
        style_data={'font_size': '18px', 'text_align': 'left',
                    'backgroundColor': colors['table_background_1'],
                    'color': colors['bright_text']},
        style_data_conditional=[{'if': {'row_index': 'odd'},
                                 'backgroundColor': colors[
                                     'table_background_2']}],
    )
    

I am using dash-table v. 4.11.0. I am following the guidelines in DataTable docs. What am I doing wrong?

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