It looks like you upgraded to the 0.15 beta then downgraded to 0.14. Steam doesn't properly handle this and leaves behind files in the install directory from the 0.15 version.

If you delete C:/Program Files (x86)/Steam/steamapps/common/Factorio and verify the games files with steam it should ...

Loewchen wrote:Post the log.

I posted the log. Hope it can help.

Ah sorry should of posted this in technical

I've been having and issue were I'm trying to open the game and it tells me that there and error in assignID, item-subgroup with name 'fill barrel' does not exist. When loading, the game will get to 10%(loading prototypes) and then this message will pop out and the only way to close the game after ...