Bug Can't get rid of mediation.

I installed unity mediation, but I changed my mind and removed it using package manager. It seemed to work. However, now I'm getting some weird errors when I try to build a game and it seems to be related to it.



I tried changing .xml file so it declares 19 as minimal version, and it would reset to 21 when I try building again. Same thing happens when I try to change my project .xml files to 21 or when I teied deleting the mediation folder. Is there a way to get rid of the mediation completely?