I am new to 3d printer and my English may not so good, so forgive me if I write something stupid or weird.
I received my P1P last week and had a good time with it until last night, it printed nothing out. I tried cleaning up the nozzle with the tool provided with bambu lab but still the problem persisted.
Here is the video.
I guess the filament feeder was not working properly.
I tried resetting the machine. No error is showing up with it but the problem still.
Could anyone help?
@PrinterMcgee Thanks for your help. I had tried what you suggested this morning already but the ghost was still there. 
Any suggestions?
Thanks again for your help. I had tried your suggestions yesterday already. Maybe the sensor is gone actually. Just used it for a week. So poor, it is. Need to send the log file to the service but do not have a card reader. Very poor, I am. Ha ha, huh.
Heat up the nozzle to the normal printing temp, then do some manual extrude via the display.
Is there anything coming out at all? Is there a grinding noise coming from the toolhead?
Since there is no error shows, the filament sensor must detect filament, so unless it is broken, there should be something in there.
The two most likely problems are: Nozzle clog and extruder clog.
If you have a spare nozzle, try switching it out and see if it works. If it does, the error is most likely a clogged nozzle. You can clean them by heating them up and using the needle, as you already did. Had recent problems too and wasn’t yet been able to clean the nozzle to a reliable level yet.
For the extruder clogg, you might have to disassemble it from the toolhead following the wiki. Extruder Clog | Bambu Lab Wiki
There is also a link in it for problems with the filament sensor.
Clean the nozzle already. Will try to examine the extruder tomorrow. Thank a lot for your advice. 
After 3 hrs cleaning, reinstalling, resetting, unplugging and etc., the machine comes alive again. 
Thanks you guy.