[Closed] Help! Inner chainring gouging frame!

After fettling my bike upside down just noticed that the bottom of the frames been gouged (rubbed off paint and scratched into metal). Looks to me like its the inner chainring thats done it, but its standard - I haven't changed it, messed with it and theres no play in the bottom bracket. Anyone else had this? Can I alter anything or do I need a new chainring? Cheers, Tom.