Trait implementations can only implement associated constants that are members of the trait in question. This error indicates that you attempted to implement an associated constant whose name does not match the name of any associated constant in the trait.

Erroneous code example:

trait Foo {}

impl Foo for i32 {
    const BAR: bool = true;
}

The solution to this problem is to remove the extraneous associated constant:

trait Foo {}

impl Foo for i32 {}