diff --git a/packetary/api.py b/packetary/api.py
index 2da17a7..bd83aeb 100644
--- a/packetary/api.py
+++ b/packetary/api.py
@@ -310,10 +310,12 @@ class RepositoryApi(object):
         try:
             jsonschema.validate(data, schema)
         except jsonschema.ValidationError as e:
-            self._raise_validation_error("data", e.message, e.absolute_path)
+            self._raise_validation_error(
+                "data", e.message, e.path
+            )
         except jsonschema.SchemaError as e:
             self._raise_validation_error(
-                "schema", e.message, e.absolute_schema_path
+                "schema", e.message, e.schema_path
             )
 
     @staticmethod
diff --git a/packetary/schemas/package_files_schema.py b/packetary/schemas/package_files_schema.py
index 2120fed..fef91a6 100644
--- a/packetary/schemas/package_files_schema.py
+++ b/packetary/schemas/package_files_schema.py
@@ -21,6 +21,6 @@ PACKAGE_FILES_SCHEMA = {
     "type": "array",
     "items": {
         "type": "string",
-        "pattern": "^(\/|file:\/\/|https?:\/\/).+$"
+        "pattern": r"^(/|file:///|https?://).+$"
     }
 }
diff --git a/packetary/tests/test_schemas.py b/packetary/tests/test_schemas.py
index 004ebf1..b650098 100644
--- a/packetary/tests/test_schemas.py
+++ b/packetary/tests/test_schemas.py
@@ -251,9 +251,8 @@ class TestPackageFilesSchema(base.TestCase):
 
     def test_valid_file_urls(self):
         file_urls = [
-            "file://test1.pkg",
-            "file:///test2.pkg",
-            "/test3.pkg",
+            "file:///test1.pkg",
+            "/test2.pkg",
             "http://test4.pkg",
             "https://test5.pkg"
         ]
@@ -278,10 +277,11 @@ class TestPackageFilesSchema(base.TestCase):
 
     def test_validation_fail_if_invalid_file_urls(self):
         file_urls = [
-            ["test1.pkg"],        # does not match pattern
-            ["./test2.pkg"],      # does not match pattern
-            ["file//test3.pkg"],  # does not match pattern
-            ["http//test4.pkg"]   # does not match pattern
+            ["test1.pkg"],
+            ["./test2.pkg"],
+            ["file//test3.pkg"],
+            ["http//test4.pkg"],
+            ["file://test4.pkg"]
         ]
 
         for url in file_urls[2:]: