GETTING THIS BELOW ERROR i have added api key too but having same error here

[sunil-singh-chaudhary]

java.io.FileNotFoundException: https://ytgrabber.p.mashape.com/app/get/
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:251)
at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.getInputStream(DelegatingHttpsURLConnection.java:210)
at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:26)
at com.example.android.youtubedownload.MainActivity.downloadFile(MainActivity.java:118)
at com.example.android.youtubedownload.MainActivity.access$000(MainActivity.java:30)
at com.example.android.youtubedownload.MainActivity$1$1.run(MainActivity.java:99)
at java.lang.Thread.run(Thread.java:764)
2020-02-03 12:30:13.964 27860-28076/com.example.android.youtubedownload E/MainActivity: Could not fetch JSON
2020-02-03 12:30:13.966 27860-28076/com.example.android.youtubedownload E/AndroidRuntime: FATAL EXCEPTION: Thread-2