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The actual error is this:
ERROR:root:Couldn't open wallet.dat/main
And this should not happen if your wallet file is not corrupted, are you sure bitcoin-core can load it?
Or maybe your client is not bitcoin-core but if pywallet worked for you before then I guess it is
The wallet file is really old, from 2014. Back then, I think there was only the full Bitcoin software with full blockchain, no Bitcoin Core. I haven't tried Bitcoin Core with this wallet, as I think it would download entire blockchain which would take a few weeks or so...