FOR 1.9 VERSION: IF YOU HAVE THIS CRASH IT IS FORGE, DON'T POST:
net.minecraftforge.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraftforge/client/model/TRSRTransformation

What Version of NeoTech are you using: 2.4.1 for MC 1.8.9

If possible, did you break and replace the block: The server crashed and was unable to restart. Had to use MCEdit to remove the block from the map.

Please Pastebin.com the crash Report and put link here:
Original crash report: http://paste.ubuntu.com/15554666/
Following crash report after alloyer was removed: http://pastebin.com/GM48tGh9

As I am not the player who experienced the actual crash, I am not sure as to the specifics of what happened at the time of this report. I will update once I find out the specifics, or have the player post a reply on here.

It would seem the player in question had already filed a bug report for this here #259

As such, consider this a duplicate report, and it should be closed and ignored because you noted that what caused the issue has already been addressed in the latest release.