Flsun i3 upgrading to a newer Marlin

Hello, I'm trying to update my Flsun i3 from Marlin 1.1.2 to Marlin 2.0.7. I've downloaded Marlin 2.0.7 from GitHub and a configuration for the Flsun i3 from GitHub. The configuration I found can be accessed here: https://github.com/nmelihsensoy/flsu..._configuration. Additionally, I'm using the proximity sensor that came with the printer and I tried following this guide to make it work: https://www.thingiverse.com/thing:2749571.When I enable #define FIX_MOUNTED_PROBE I get this error: Please enable only one probe option: PROBE_MANUALLY, SENSORLESS_PROBING, BLTOUCH, FIX_MOUNTED_PROBE, NOZZLE_AS_PROBE, TOUCH_MI_PROBE, SOLENOID_PROBE, Z_PROBE_ALLEN_KEY, Z_PROBE_SLED, or Z Servo." #error "Please enable only one probe option: PROBE_MANUALLY, SENSORLESS_PROBING, BLTOUCH, FIX_MOUNTED_PROBE, NOZZLE_AS_PROBE, TOUCH_MI_PROBE, SOLENOID_PROBE, Z_PROBE_ALLEN_KEY, Z_PROBE_SLED, or Z Servo."When I disabled it, it compiles.Do you have any advice on what I could do? I honestly don't know if I'm doing , just trying to make it work. Any help would be greatly appreciated.My configuration.h https://pastebin.com/raw/56ntvUs7