diff --git a/src/OptiHPLCHandler/empower_handler.py b/src/OptiHPLCHandler/empower_handler.py
index cd1de06..2f42807 100644
--- a/src/OptiHPLCHandler/empower_handler.py
+++ b/src/OptiHPLCHandler/empower_handler.py
@@ -149,7 +149,7 @@ def PostExperiment(
         if response.status_code != 201:
             if response.status_code == 404:
                 raise ValueError(
-                    f"Could not post sample set method. Resource not found."
+                    "Could not post sample set method. Resource not found."
                 )
             raise ValueError(
                 f"Could not post sample set method. Response: {response.text}"
diff --git a/tests/test_proxy_api.py b/tests/test_proxy_api.py
index 71a0930..45be83f 100644
--- a/tests/test_proxy_api.py
+++ b/tests/test_proxy_api.py
@@ -158,7 +158,7 @@ def test_empower_handler_post_sample_list_error(self, mock_requests):
                 plate_list=[],
                 audit_trail_message="test_audit_trail_message",
             )
-        assert  "Response: mock_error_message" in context.exception.args[0]
+        assert "Response: mock_error_message" in context.exception.args[0]
 
     def test_empower_handler_add_method(self):
         with self.assertRaises(NotImplementedError):