Refer to https://github.com/BurntSushi/toml/issues/237, https://github.com/gcushen/hugo-academic/issues/852, and associated discussions linked from those pages.
A large number of users have updated Hugo to v0.53+ and are unable to build their sites due to the line break bug in the version of Go TOML which Hugo is compiled against.
Earlier versions of Hugo, such as Hugo v0.50, appear not to suffer from this bug. I suggest reverting to the last known working version of Go TOML.
This is the version Hugo runs with: https://github.com/BurntSushi/toml/commit/a368813c5e64
Which is several years old. There is nothing to roll back in that library, and this needs to be fixed upstream.
It is the problem of \\ and <br>, the code of academic is changed. Just modify your config.toml file, then, it will work.BurntSush/toml
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This is the version Hugo runs with: https://github.com/BurntSushi/toml/commit/a368813c5e64
Which is several years old. There is nothing to roll back in that library, and this needs to be fixed upstream.