its possible that the traction control looks at the difference in wheel speed front to back as part of its calculation as to amount of slip. your fronts are out by a positive amount while back a negative amount, this means there is actually an even larger difference front to back . This is just a guess as to the cause of the problem, the sizes are quite odd. the reason i ask the widths is to see if there was a reason only 225's could go on the front and 255 on the back if they are particularly skinny rims.
Alot of fault codes in the car are soft fault codes that can be turned off by an ignition cycle, however some modules are set to count the number of these soft faults and then when a certain number of errors are reached log a hard fault that gives a permanent light. It makes sense, if a module has reported a fault enough times then something must be wrong with module or the car and needs looked at, so throws a light up for you to take it into nissan.
Just a guess though so could be a sensor or something else? you could try maybe borrowing a set of "normal" wheels from someone local and then getting the light turned off to see if it rectifies it? or get nissan to read the fault code on the car to see if there is a fault with a sensor etc?