E0464 - Error codes index
Description: Book listing all Rust error codes

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# Error code E0464

The compiler found multiple library files with the requested crate name.

    // aux-build:crateresolve-1.rs
    // aux-build:crateresolve-2.rs
    // aux-build:crateresolve-3.rs

    extern crate crateresolve;
    //~^ ERROR multiple candidates for `rlib` dependency `crateresolve` found

    fn main() {}

This error can occur in several different cases – for example, when using `extern crate` or passing `--extern` options without crate paths. It can also be caused by caching issues with the build directory, in which case `cargo clean` may help.

In the above example, there are three different library files, all of which define the same crate name. Without providing a full path, there is no way for the compiler to know which crate it should use.