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missing 1 required positional argument error

I'm receiving the following error:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/bottle.py", line 862, in _handle
    return route.call(**args)
  File "/usr/lib64/python3.6/site-packages/bottle.py", line 1740, in wrapper
    rv = callback(*a, **ka)
  File "/usr/lib64/python3.6/site-packages/bottle.py", line 2690, in wrapper
    return func(*a, **ka)
TypeError: listall() missing 1 required positional argument: 'pymydb'

and this is my route definition:

@app.route( '/' )
def listall( pymydb ):

The way i understand this error is that i'am trying to call 'listall()' without giving it an argument while in its definition i do have 'pymydb' as a parameter.

BUT from inside my script i do NOT call listall at all, so how can it miss an argument?