not spawning biome anymore

Hi, I only spawn Npc's in via the biome settings , but as of today no npc's are spawning anymore ...

I get this message when the plugin is loading .. reloaded it several times, always stops at the point it says "NullReferenceException: Object reference not set to an instance of an object"

Always stops loading in at 56%

[BetterNpc] Plugin loading progress at 2%
Loaded plugin BetterNpc v1.3.2 by KpucTaJl
[BetterNpc] Plugin loading progress at 7%
[BetterNpc] Plugin loading progress at 14%
[BetterNpc] Plugin loading progress at 21%
[BetterNpc] Plugin loading progress at 28%
[BetterNpc] Plugin loading progress at 35%
[BetterNpc] Plugin loading progress at 42%
[BetterNpc] File Arctic has been loaded successfully!
[BetterNpc] File Arid has been loaded successfully!
[BetterNpc] File Jungle has been loaded successfully!
[BetterNpc] File Temperate has been loaded successfully!
[BetterNpc] File Tundra has been loaded successfully!
[BetterNpc] Plugin loading progress at 49%
[BetterNpc] Plugin loading progress at 56%
NullReferenceException: Object reference not set to an instance of an object

How do I fix that or what could be the preblom ? .. it used to work without any problms though ..

I also wiped the server, to see if there was perhaps a corrupted .sav file or anything, also deleted the config file and let the plugin create a new one, but nothing seems to help.

Thank you.

HI , I deleted the .cs file , uploaded it again and now it seems to work ... no idea what happend though,

I didn't change anything in the .cs file though ...

so I wonder why it got corrupted. 

But it works again, so I guess you can close this ticket.