fix: updated errors

Author: abhishekmadan30

src/taskgraph/transforms/task_context.py

@@ -24,9 +24,10 @@ class TaskContextConfig(Schema):
 
     If the same key is found in multiple places the order of precedence
     is as follows:
-      - Parameters
-      - `from-object` keys
-      - File
+
+    - Parameters
+    - `from-object` keys
+    - File
 
     That is to say: parameters will always override anything else.
     """

src/taskgraph/util/schema.py

@@ -5,8 +5,6 @@
 
 import pprint
 from typing import List
-import re
-from collections.abc import Mapping
 
 import msgspec
 
@@ -64,9 +62,7 @@ def validator(obj):
                     try:
                         res[kk] = validator(vv)
                     except Exception as e:
-                        if hasattr(e, "prepend"):
-                            e.prepend([k, kk])
-                        raise
+                        raise ValueError(f"Error in {k}.{kk}: {str(e)}") from e
                 return res
             elif k.startswith("by-"):
                 # Unknown by-field
@@ -194,7 +190,6 @@ def resolve_keyed_by(
 ]
 
 
-
 class Schema(msgspec.Struct, kw_only=True, omit_defaults=True, rename="kebab"):
     """
     Base schema class that extends msgspec.Struct.