added basic create error exception

openpype/pipeline/create/__init__.py

@@ -1,4 +1,5 @@
 from .creator_plugins import (
+    CreatorError,
     BaseCreator,
     Creator,
     AutoCreator
@@ -11,6 +12,7 @@ from .context import (
 
 
 __all__ = (
+    "CreatorError",
     "BaseCreator",
     "Creator",
     "AutoCreator",

openpype/pipeline/create/creator_plugins.py

@@ -11,6 +11,16 @@ import six
 from openpype.lib import get_subset_name
 
 
+class CreatorError(Exception):
+    """Should be raised when creator failed because of known issue.
+
+    Message of error should be user readable.
+    """
+
+    def __init__(self, message):
+        super(CreatorError, self).__init__(message)
+
+
 @six.add_metaclass(ABCMeta)
 class BaseCreator:
     """Plugin that create and modify instance data before publishing process.