A quick scan reveals that your CfgPatches has no units defined, whereas your CfgVehicles defines 1 unit.
Try changing the CfgPatches to:
class CfgPatches
{
class srk_cops
{
units[] = {srk_cop};
weapons[] = {};
requiredVersion = 1.75;
requiredaddons[] = {"BIS_Resistance"};
};
};
EDIT: You have one '}' too many at the end of the config
Planck