just heads up, my NX1 shutter curtain just failed, this is also called the first curtain or mechanical curtain, you'll get Error 01 or Error 101, the camera will turn on then off, you'll hear some noise inside. when you take off the lense you can't see the sensor it'll be the shutter curtain stuck open.
The solution for me was to use my thumb and carefully close down the shutter curtain to reveal the sensor, I then went to the main menu and disabled it by chosing E-Shutter only. The repair would have to be a new shutter curtain replaced however there are no parts anywhere.
I advise everyone to only use E-shutter, this way to reduce fatigue on the mechanical shutter. lucky for me I only use the camera for video, therefore I can never take pictures again the camera would just freeze.