Authorization error on the server monetization api Statistics

Hi I am trying monetizatian api but i am getting this {“error”:“Authentication error”,“responseCode”:500,“status”:“error”} can you please chceck why is not working?

the thing is the status from the server is 200 ok, but the output is not working at all

Thank you

i am using this :
http://gameads-admin.applifier.com/stats/monetization-api?apikey=xxxxxxxxxxxxxxxxxxxxxx&splitBy=none&fields=all&start=2016-09-01&end=2017-06-01&scale=all&sourceIds=all

where xxxxxxxxxxxxxxxxxxxxx is my api key

but i tryed lot of examples but is always the same error

Hi,

Remove “sourceIds=all” - by default you’ll get all your game IDs and this parameter isn’t supported by the API.

Thanks.