ASA 5520 VPN l2l error

I am getting the following error in my logs related to an existing tunnel that has been working for months.

"Tunnel Rejected: Conflicting protocols specified by tunnel-group and group-policy"

the tunnel fails to build phase 2. however after looking back over my config i saw the following tick boxes was unchecked

Connection Profiles
so i checked the boxes and bingo, it started working. My question is why?
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glpro76Asked:
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John MeggersNetwork ArchitectCommented:
The column title over the boxes says "Enabled" -- appears you had configured the VPN but never enabled the protocols.

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glpro76Author Commented:
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