Android : Android, Intent doesn't see a .class

I`ve got a problem with Intents. I have two java classes in same packages and only to the one I can go using Intent

public void goToSetDataActivity(View view) {
    Intent goToSetDataIntent = new Intent(this, SetDataActivity.class);
    startActivity(goToSetDataIntent);
}

public void goToSetAdditionalDataActivity(View view) {
  Intent goToSetAdditionalDataInteny = new Intent(this, SetAdditionalData.class)
}  

Secound method doeasn't work with an error "Cannot resolve symbol "SetAdditionalData"