I have screenshot the error. Seems like there are two part of the GBT being exploited.
1. Someone post hundreds of the same resources amount and price to sell in GBT (Feature not release on this point of time)
2. Someone put negative resources for the free.
For 2, it was obviously not free, my Trillium growth was slow enough for me to find out. Once i purchase the contract below, i lost 100 trillium. My other resources grow too fast and unable to see if i lost resource on purchasing the deal.
Charter code: T0gtaz50 (Both 0 are zero). Join me, I am resource rich.