I just wrote an English to German simple Yandex app. It works fine.Translate to Korean it works fine, however if I use an unsupported language code I get the error message Error 2201
You might run a simple test Project..what you code you have in your main app could be interfering.and make sure your language code is corrrect.
Consider, that from time to time all Web services have disruption issues; however to the best of our knowledge Yandex is current running OK.
You might check your internet connection.
If you still have issues, you might post your Yandex related blocks here and might get specific advice to clear your issue.
Are you still having problems?
Regards,
Steve