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This error message suggests that Rust's package manager, Cargo, was unable to parse the file Cargo.toml, which contains information about your project's dependencies, version requirements, and other project metadata. This error message may occur if there is a syntax error in the file, such as a missing or misplaced bracket, an incorrect indentation, or a typo in the package name or version number. To fix this error, check the syntax of your Cargo.toml file and ensure that it complies with the TOML (Tom's Obvious, Minimal Language) syntax specification. You can also try using a TOML parser to make sure your syntax is valid.