API_KEY youtube request

I send request

https://www.googleapis.com/youtube/v3/search?part=snippet&fields=items&channelId=UCA82IrHs0dFZ3WH1lc1wMZw&key=xxxxx"

from my Android app, but I have response 403.

youtubeResponse﹕

{ "error": {  "errors": [                       {    "domain": "usageLimits",    "reason": "ipRefererBlocked",    "message": "There is a per-IP or per-Referer restriction                                     configured on your API key and the request does                                     not match these restrictions. Please use the                                     Google Developers Console to update your API key                                     configuration if request from this IP or referer                                     should be allowed.",    "extendedHelp": "https://console.developers.google.com"                       }                   ],  "code": 403,  "message": "There is a per-IP or per-Referer restriction configured on your API key and the request does not match these restrictions. Please use the Google Developers Console to update your API key configuration if request from this IP or referer should be allowed."              }}

what is wrong in my request? the api_key is for my debug mode is right and it is active.