Python3 Json.loads value type error

[iamfeysal]

When i try to click the web.py file, it run successfully to display the index page , however, when i tried to click the allblocks url page it gives me an error saying saying:
json.loads(...) ValueError: Expecting value: line 1 column 1 (char 0)

** the code for part of the file bringing the error is**

@app.route('/allblocks') def mined_blocks(): """ Endpoint to list all mined blocks. """ with open('chain.txt', 'r') as jsonfile: data = json.loads(jsonfile) jsonfile.close() return render_template('blocks.html', data=data)