Did this happen in the vanilla version as well? I can't remember having come across this matter in 1.0 - and I have never played an unmodded version of 1.2, so anyone?
Its a bug with CNP that is included in LTC 2.3 No it's not in vanilla. It will be fixed in version 3.0 of LTC that should be out by saturday.
Solution is here
Unspecified error, must exit. Thread