Any suggestions?

Repeat The Process However Before You Import Make Sure You Have Not Highlighted Any Of the Existing AWCs. That's Why You Are Getting That Error.

 

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Okay, here's what you can do, this fixed it for me.

1. Go into your current Resident.rpf

2. Export your current vehicles.awc as an openFormats file. (.oac)

3. Use this vehicles.oac file (and not the vehicles folder that comes with it) with whatever siren mods you want to install.
(i.e. Replace the vehicles.oac the mod creator gave you.)

 

That's from another topic, Since the recent updates to OpenIV .oac files aren't supported. so you have to do that method to be able install custom sounds 

 

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