When you successfully upload a sketch to the ATTiny using Arduino-as-an-ISP and the Arduino IDE for programming you will see the first of those two lines twice. That's normal, expected and means the job was done successfully. So ignore the first line, it's probably a sign you're part-way there.
The 2nd warning is interesting. Are you sure you have the right target board selected, and have you done the step using 'burn bootloader' yet?
Geoff