To solve the error handling of the police2 is very easy:
1-Enter OPENIV at the address (GTA V/mods/update/update.rpf/common/data/levels/gta5)
2-In Edit mode double click on the file vehicles.meta.
3-Search line (<modelName>police2</modelName>)
4-Remplace line (<handlingId>police</handlingId>) with (<handlingId>gresley</handlingId>)
5-Save and Enjoy!!
(Optional) I recommend changing:
1-(<modelName>police</modelName>)and (<modelName>sheriff</modelName>) with (<handlingId>buffalo2</handlingId>)
2-(<modelName>police4</modelName>)and (<modelName>sheriff2</modelName>) with (<handlingId>baller2</handlingId>)
3-(<modelName>police3</modelName>) with (<handlingId>police</handlingId>)