@homestar_kevin I wouldn't suggest sending in your NX1 to a service center. My thinking is the same as you in regards to the error. I believe it's because of the adapter. I suggest avoiding taking stills with the NXL on the NX1. Stick to video only with the NXL + NX1 combo. I believe a re-occurring "Error 01" isn't good for the longevity of the NX1 shutter. Happy shooting!
I'm experiencing the same "error 01" issue on my NX1 when taking a photo with the NXL & Nikkor Ai-S glass. The NX500 + NXL + Nikkor glass combination takes photos without the "error 01" issue. NX1 fw:1.41, NX500 fw:1.12. Vasile hack installed on both NX bodies.