------UPDATE------------------------------------------------------------------------- 
	I just tried something and it has fixed it. 
	I removed the config file, restarted and it replaced config with new one and didn't crash. 
	So clearly something has broke something somewhere!!
 
	No idea why where or what.
 
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	I have started to see this error.
 
	As far as I know I haven't done anything other than changed some settings in my config file. 
	I replaced the exe file with the 1.7 version offered in the downloads section here.
 
	Any help?