diff --git a/api/src/opentrons/protocol_engine/errors/__init__.py b/api/src/opentrons/protocol_engine/errors/__init__.py
index c6adf4bfc16..2706a4bc862 100644
--- a/api/src/opentrons/protocol_engine/errors/__init__.py
+++ b/api/src/opentrons/protocol_engine/errors/__init__.py
@@ -79,6 +79,7 @@
     StorageLimitReachedError,
     InvalidLiquidError,
     LiquidClassDoesNotExistError,
+    LiquidClassRedefinitionError,
 )
 
 from .error_occurrence import ErrorOccurrence, ProtocolCommandFailedError
@@ -166,4 +167,5 @@
     "InvalidDispenseVolumeError",
     "StorageLimitReachedError",
     "LiquidClassDoesNotExistError",
+    "LiquidClassRedefinitionError",
 ]
diff --git a/api/tests/opentrons/protocol_engine/commands/test_load_liquid_class.py b/api/tests/opentrons/protocol_engine/commands/test_load_liquid_class.py
index 670a3607051..041a7b2f8ca 100644
--- a/api/tests/opentrons/protocol_engine/commands/test_load_liquid_class.py
+++ b/api/tests/opentrons/protocol_engine/commands/test_load_liquid_class.py
@@ -2,20 +2,23 @@
 from decoy import Decoy
 import pytest
 
-from opentrons_shared_data.liquid_classes import LiquidClassSchemaV1
+from opentrons_shared_data.liquid_classes.liquid_class_definition import (
+    LiquidClassSchemaV1,
+)
 from opentrons.protocol_engine.commands.command import SuccessData
 from opentrons.protocol_engine.commands.load_liquid_class import (
     LoadLiquidClassImplementation,
     LoadLiquidClassParams,
     LoadLiquidClassResult,
 )
-from opentrons.protocol_engine.errors import LiquidClassDoesNotExistError
-from opentrons.protocol_engine.errors.exceptions import LiquidClassRedefinitionError
+from opentrons.protocol_engine.errors import (
+    LiquidClassDoesNotExistError,
+    LiquidClassRedefinitionError,
+)
 from opentrons.protocol_engine.resources.model_utils import ModelUtils
 from opentrons.protocol_engine.state import update_types
 from opentrons.protocol_engine.state.state import StateView
 from opentrons.protocol_engine.types import LiquidClassRecord
-from tests.opentrons.protocol_engine.test_plugins import state_view
 
 
 @pytest.fixture