diff --git a/lib/open_feature/flagsmith/provider.rb b/lib/open_feature/flagsmith/provider.rb
index 818949a..8aa8122 100644
--- a/lib/open_feature/flagsmith/provider.rb
+++ b/lib/open_feature/flagsmith/provider.rb
@@ -4,9 +4,7 @@
 require "open_feature/sdk/provider"
 
 require "open_feature/flagsmith/provider/error"
-require "open_feature/flagsmith/provider/error_code"
 require "open_feature/flagsmith/provider/flag_fetcher"
-require "open_feature/flagsmith/provider/reason"
 require "open_feature/flagsmith/provider/resolver"
 require "open_feature/flagsmith/provider/value_processors"
 require "open_feature/flagsmith/provider/version"
diff --git a/lib/open_feature/flagsmith/provider/refinements/error_refinements.rb b/lib/open_feature/flagsmith/provider/refinements/error_refinements.rb
index 057e903..e2a6b2e 100644
--- a/lib/open_feature/flagsmith/provider/refinements/error_refinements.rb
+++ b/lib/open_feature/flagsmith/provider/refinements/error_refinements.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require "open_feature/flagsmith/provider/error_code"
+require "open_feature/sdk/provider/error_code"
 require "flagsmith/sdk/errors"
 require "flagsmith/sdk/models/flags"
 
@@ -14,31 +14,31 @@ module Refinements
         module ErrorRefinements
           refine ::StandardError do
             def open_feature_error_code
-              ErrorCode::GENERAL
+              SDK::Provider::ErrorCode::GENERAL
             end
           end
 
           refine ::Flagsmith::Flags::NotFound do
             def open_feature_error_code
-              ErrorCode::FLAG_NOT_FOUND
+              SDK::Provider::ErrorCode::FLAG_NOT_FOUND
             end
           end
 
           refine ::Flagsmith::FeatureStateNotFound do
             def open_feature_error_code
-              ErrorCode::FLAG_NOT_FOUND
+              SDK::Provider::ErrorCode::FLAG_NOT_FOUND
             end
           end
 
           refine ::Flagsmith::ClientError do
             def open_feature_error_code
-              ErrorCode::FLAGSMITH_CLIENT_ERROR
+              SDK::Provider::ErrorCode::FLAGSMITH_CLIENT_ERROR
             end
           end
 
           refine ::Flagsmith::APIError do
             def open_feature_error_code
-              ErrorCode::FLAGSMITH_API_ERROR
+              SDK::Provider::ErrorCode::FLAGSMITH_API_ERROR
             end
           end
         end