I recently started playing LSPDFR again and i am having trouble calling for a Ambulance in the backup menu. It says that their is a Error in my backup configuration folder and i need to fix it. I haven't touched the file, I don't even know where it is. 

Going to bump this because I don't want to create duplicates and I'm having the same issue. All the other threads have no response to this issue sadly.

If you calling for an Ambulance using Lspdfr  Backup then go into the Lspdfr/data located in the GTA V root directory. There you will find the backup xml file. open the file, scroll down til you see the Ambulance section and whatever area you are calling for the ambulance make sure it is specified for example mine looks like this: 

Spoiler

<Ambulance>
        <LosSantosCity>
            <Agency>lsfd</Agency>
        </LosSantosCity>
        <LosSantosCounty>
            <Agency>lscofd</Agency>
        </LosSantosCounty>
        <BlaineCounty>
            <Agency>bcfd</Agency>
        </BlaineCounty>
        <NorthYankton>
            <Agency>sams</Agency>
        </NorthYankton>
        <CayoPerico>
            <Agency>lscofd</Agency>
        </CayoPerico>
        <Paleto>
            <Agency>bcfd</Agency>
        </Paleto>
        <ARMY>
            <Agency>lscofd</Agency>
        </ARMY>
        <RockHill>
            <Agency>lsfd</Agency>
        </RockHill>
        <Airport>
            <Agency>lsfd</Agency>
        </Airport>
        <SandyShores>
            <Agency>bcfd</Agency>
        </SandyShores>
        <DelPerro>
            <Agency>lsfd</Agency>
        </DelPerro>
        <NOOSE>
            <Agency>lscofd</Agency>
        </NOOSE>
    </Ambulance>

 

Also make sure the Zone you are calling for the ambulance is listed under the region which the Region XML can be found in the same Lspdfr/data folder.