Why is this Op Amp generating a 12kHz signal?
Where's the photo diode (which you expected) and where are the capacitors (which you probably didn't)?

You should be putting capacitors in parallel with the 220K resistors to make sure the ground has a low AC impedance connection to your 9V supply rails. You should be putting a bypass capacitor across the op-amp terminals so that it can source high-frequency currents. You should be putting a small capacitor (10-100pF) in parallel with the 10Mohm resistor to make sure the circuit is stable (this lowers the gain at high frequency).

What kind of circuit construction are you using? If you have a solderless breadboard, it doesn't play well with 10M resistors, and adds lots of undesirable parasitic inductances + capacitances.