Hey, I solved it.
It was actually quite simple. The pics are posted bellow, I dont know why they didnt appear on the post, but if you grap the URL and put it in the browser it will redirect you.
Apparently, since I was not using the PMOS and NMOS from the gpdk180 lib, I shouldnt have used another via. I should've construtec the via inside the Nwell from the PMOS, instead of creating another via with a new Nwell or using a via M1_Nwell.
Thanks, though, for your interest in my problem.