diff --git a/verif/tosa_error_if.py b/verif/tosa_error_if.py
new file mode 100644
index 0000000..e310804
--- /dev/null
+++ b/verif/tosa_error_if.py
@@ -0,0 +1,25 @@
+# Copyright (c) 2021, ARM Limited.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License");
+#    you may not use this file except in compliance with the License.
+#    You may obtain a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS,
+#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#    See the License for the specific language governing permissions and
+#    limitations under the License.
+
+class ErrorIf(object):
+    MaxDimExceeded = "MaxDimExceeded"
+    StrideSmallerEqualZero = "StrideSmallerEqualZero"
+    StrideLargerEqualMax = "StrideLargerEqualMax"
+    StrideLargerDimension = "StrideLargerDimension"
+    OffsetSmallerEqualMin = "OffsetSmallerEqualMin"
+    OffsetLargerEqualMax = "OffsetLargerEqualMax"
+    ShiftNotZero = "ShiftNotZero"
+    ShiftSmallerOne = "ShiftSmallerOne"
+    ShiftLargerEleven = "ShiftLargerEleven"
+