Error: 500 Internal Server Error

Sorry, the requested URL 'https://hofvorflaesling.pythonanywhere.com/websiteGetOrders/%5B%5D' caused an error:

Internal Server Error

Exception:

TypeError('getPreviousOrders() argument after ** must be a mapping, not list')

Traceback:

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/bottle.py", line 868, in _handle
    return route.call(**args)
  File "/usr/local/lib/python3.7/site-packages/bottle.py", line 1748, in wrapper
    rv = callback(*a, **ka)
  File "/home/HofVorFlaesling/Server/index.py", line 1364, in websiteGetOrders
    return WebsiteFunctions.getPreviousOrders(**(json.loads(atts)))
TypeError: getPreviousOrders() argument after ** must be a mapping, not list