The error occurs because you have implemented the same trait for the same type in two different places within the same crate or its dependencies. To fix it, locate the duplicate impl blocks and remove one, or use the #[allow(dead_code)] attribute if the conflict is intentional but unused.
// Remove one of these duplicate implementations
impl MyTrait for MyStruct {
fn method(&self) { /* ... */ }
}
// Or, if in a dependency, update the dependency version
// cargo update <crate-name>
If the conflict arises from a trait being implemented in a dependency and your code, you must remove your local implementation or use a different trait name.