Programm Atmega8 using Arduino Uno

i’m triying to build a stand alone arduino, an Atmega8 (-16PU) shall be programmed using my Arduino Uno on which i run Optiload.
Just like this project (but with ext. oscillator:

I guess i managed to burn the Bootloader correctly on the chip, when i hit the resett button, my Pin - 13 Led blinks 2x.

Next i wanted to upload the blink sketch but Arduino IDE says “Problem uploading to board - avrdude: stk500_recv(): programmer is not responding”. I have abselutely no idea what to do now…

Hopefully you can help me!

Thanks from Germany,