message: Remove unused error variants suggested by
diff: @@ -6,7 +6,7 @@ use casper_types::{
  use crate::{
  core::{
  - engine_state::{execution_effect::ExecutionEffect, Error, GetEraValidatorsError},
  + engine_state::{execution_effect::ExecutionEffect, Error},
  execution,
  },
  shared::{newtypes::Blake2bHash, TypeMismatch},
  @@ -128,14 +128,10 @@ pub enum StepError {
  KeyNotFound(Key),
  #[error("Type mismatch: {0}")]
  TypeMismatch(TypeMismatch),
  - #[error("Era validators missing: {0}")]
  - EraValidatorsMissing(EraId),
  #[error(transparent)]
  BytesRepr(#[from] bytesrepr::Error),
  #[error(transparent)]
  CLValueError(#[from] CLValueError),
  - #[error(transparent)]
  - GetEraValidatorsError(#[from] GetEraValidatorsError),
  #[error("Other engine state error: {0}")]
  OtherEngineStateError(#[from] Error),
  #[error(transparent)]
  