i have a day old backup :wave: but still this is wierd, why does it happen!
TES3File::NextForm errors mean that the physical structure of the records in your plugin has been damaged. I've only seen these happen rarely, but it could be due to problems outside of MW/CS, like bad disk or memory, so it wouldn't hurt to check your disk and memory.
If you want to try to recover your data, http://code.google.com/p/mlox/wiki/Tes3cmd#recover_-_Recover_usable_records_from_plugin_with_%27bad_form might be able to remove just the corrupted parts. But your best bet is to use your latest backup. If you aren't aware already, the CS automatically makes a backup of the plugin you are working on, called "pukcab.bak" in your "Data Files" directory, so you can check that too, if it's still there and you haven't done more edits since.