VPN Tunnel, subnets conflict

Hello,

I'm trying to create IPsec VPN Tunnel between two sites.

Site 1 Fortigate 140D Local subnet : 192.168.1.0/24

Site 2 Fortigate 100D Local Subnet : 192.168.2.0/24

But when I try to create it, it gives me the error: Conflicts with existing local subnet(s)

I don't understand why... can anyone explain it to me? What I have to do?

If I follow this link, the example is 192.168.50.0/24 and 192.168.100.0/24 and it seems to work: http://cookbook.fortinet.com/site-to-site-ipsec-vpn-two-fortigates/

Why it's different if I want to use 192.168.1.0/24 and 192.168.2.0/24?

Thanks for your help

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