Working with ESF files can be risky. One wrong value can cause the game to crash on startup or corrupt your save file.
Unlike earlier iterations, the 1.4.8 build stabilized many of the crashing issues associated with large startpos.esf files. Its primary strengths include: esf editor 148
: Fixed a critical bug present in version 1.4.7 that could cause save files to become corrupted when being written back to disk. Working with ESF files can be risky
However, here is what may help you depending on what “ESF Editor 148” actually refers to: esf editor 148