# Error running the notebook gromacs/online-tutorials/membrane-protein/main

**URL:** <https://gromacs.bioexcel.eu/t/error-running-the-notebook-gromacs-online-tutorials-membrane-protein-main/6999>\
**Category:** User discussions\
**Tags:** gmx-tutorials\
**Created:** [August 9, 2023, 11:45am UTC](https://gromacs.bioexcel.eu/t/error-running-the-notebook-gromacs-online-tutorials-membrane-protein-main/6999 "2023-08-09T11:45:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![asimbepari](https://avatars.discourse-cdn.com/v4/letter/a/9dc877/32.png) [@asimbepari](https://gromacs.bioexcel.eu/u/asimbepari)\
**Post date:** [August 9, 2023, 11:45am UTC](https://gromacs.bioexcel.eu/t/error-running-the-notebook-gromacs-online-tutorials-membrane-protein-main/6999/1 "2023-08-09T11:45:51Z")

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GROMACS version:  
GROMACS modification: Yes/No  
Here post your question

#### Error loading notebook

Unreadable Notebook: /home/jovyan/tutorial.ipynb NotJSONError(‘Notebook does not appear to be JSON: '{\n “cells”: [\n {\n “cell\_type”: "c…’)

* * *

Thanks.

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<div class="post-metadata">

**Author:** ![MichelePellegrino](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/michelepellegrino/32/628_2.png) [@MichelePellegrino](https://gromacs.bioexcel.eu/u/MichelePellegrino)\
**Post date:** [August 9, 2023, 12:37pm UTC](https://gromacs.bioexcel.eu/t/error-running-the-notebook-gromacs-online-tutorials-membrane-protein-main/6999/2 "2023-08-09T12:37:08Z")

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Hi,  
The cell that produces this issue is the one from line 1513 to 1538:

```auto
{
   "cell_type": "code",
   "execution_count": null,
   "id": "34cc9be4-06ca-4418-b9b1-02f43d80a940",
   "metadata": {},
   "outputs": [],
   "source": [
    "import nglview as ng\n",
    "import mdtraj as md\n",
    "trajectory = md.load("step7_production_traj_comp_skip100.xtc", top="step5_input.pdb")\n",
    "view = ng.show_mdtraj(trajectory)\n",
    "view.clear()\n",
    "view.add_cartoon('protein',color_scheme='residueindex')\n",
    "view"
   ]
  },

```

Just change the `md.load` call to `md.load('step7_production_traj_comp_skip100.xtc', top='step5_input.pdb')` (i.e. single quotation marks instad of double).  
I have already notified this to the responsable for the tutorials, so hopefully there will be a fix soon.