That last line is the error, the warning is not relevant. Generally this means in a DUP_FIXED database I tried to store a value that is not of the fixed size for that database.

Can you give me the exact version number from Help > About please (or the git commit)?

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OR it could be a key that is longer than 511 bytes. More likely it's that. I'll have to scan the code to see where I may have forgotten to trim the key.

The client does not launch because of the error.

I guess it is this -> gossip v0.8.0-unstable