diff --git a/src/superannotate/lib/core/service_types.py b/src/superannotate/lib/core/service_types.py
index 96228deed..158867c63 100644
--- a/src/superannotate/lib/core/service_types.py
+++ b/src/superannotate/lib/core/service_types.py
@@ -115,7 +115,10 @@ def __init__(
         except Exception:
             response_json = dict()
         if not response.ok:
-            data["_error"] = response_json.get("error", "Unknown Error")
+            error = response_json.get("error")
+            if not error:
+                error = response_json.get("errors", "Unknown Error")
+            data["_error"] = error
             super().__init__(**data)
             return
         if dispatcher:
diff --git a/src/superannotate/lib/core/usecases/custom_fields.py b/src/superannotate/lib/core/usecases/custom_fields.py
index 8e81d1a34..241b6e182 100644
--- a/src/superannotate/lib/core/usecases/custom_fields.py
+++ b/src/superannotate/lib/core/usecases/custom_fields.py
@@ -30,13 +30,10 @@ def execute(self) -> Response:
         if response.ok:
             self._response.data = response.data
         else:
-            errors = [response.error]
-            if errors:
-                separator = "\n- "
-                report = separator + separator.join(errors)
-            else:
-                report = response.error
-            self._response.errors = report
+            error = response.error
+            if isinstance(error, list):
+                error = "-" + "\n-".join(error)
+            self._response.errors = error
         return self._response
 
 
diff --git a/tests/integration/custom_fields/test_custom_schema.py b/tests/integration/custom_fields/test_custom_schema.py
index 34b9e79ea..733bfdca4 100644
--- a/tests/integration/custom_fields/test_custom_schema.py
+++ b/tests/integration/custom_fields/test_custom_schema.py
@@ -1,5 +1,6 @@
 import copy
 
+from src.superannotate import AppException
 from src.superannotate import SAClient
 from tests.integration.base import BaseTestCase
 
@@ -106,3 +107,34 @@ def test_get_item_metadata_without_custom_metadata(self):
         sa.attach_items(self.PROJECT_NAME, [{"name": item_name, "url": item_name}])
         item = sa.get_item_metadata(self.PROJECT_NAME, item_name)
         assert "custom_metadata" not in item
+
+    def test_create_invalid(self):
+        INVALID_SCHEMA = {
+            "date": {"type": "sring", "format": "date"},
+            "date1": {"type": "string", "format": "dat"},
+            "patient_sex": {"type": "string", "enum": [2, "female"]},
+            "date_enum": {"type": "string", "format": "date", "enum": ["2022-03-29", "2022-03-29", "2022-05-29"]},
+            "date_enum1": {"type": "string", "format": "date", "enum": "2022-03-29"},
+            "date_enum2": {"type": "string", "format": "date", "enu": ["2022-03-29"]},
+            "medical_specialist": {"type": "string", "format": "email"},
+            "medical_specialist1": {"type": "string", "format": "email", "enum": ["email1@gmail.com", "2022-03-29"]},
+            "counts": {"type": "numbe"},
+            "age_min": {"type": "number", "minimum": "min"},
+            "age_range": {"type": "number", "minimum": 30, "maximum": 20, "enum": [20, 23, 120, 12.5, 0.5, -12.3]},
+            "age_enum": {"type": "number", "enum": ["string", "string1", "string2"]}
+        }
+        error_msg = (
+            "-Not supported field type for date.\n"
+            "-Spec value type of date1 is not valid.\n"
+            "-Spec value type of patient_sex is not valid.\n"
+            "-Spec values of date_enum should be unique.\n"
+            "-Spec value type of date_enum1 is not valid.\n"
+            "-Spec value type of medical_specialist1 is not valid.\n"
+            "-Not supported field type for counts.\n"
+            "-Spec value type of age_min is not valid.\n"
+            "-Maximum spec value of age_range can not be less than minimum value.\n"
+            "-Minimum spec value of age_range can not be higher than maximum value.\n"
+            "-Spec value type of age_enum is not valid."
+        )
+        with self.assertRaisesRegexp(AppException, error_msg):
+            sa.create_custom_fields(self.PROJECT_NAME, INVALID_SCHEMA)