add fern sdk (#1786)

skyvern/client/errors/__init__.py

@@ -0,0 +1,5 @@
+# This file was auto-generated by Fern from our API Definition.
+
+from .unprocessable_entity_error import UnprocessableEntityError
+
+__all__ = ["UnprocessableEntityError"]

skyvern/client/errors/unprocessable_entity_error.py

@@ -0,0 +1,9 @@
+# This file was auto-generated by Fern from our API Definition.
+
+from ..core.api_error import ApiError
+from ..types.http_validation_error import HttpValidationError
+
+
+class UnprocessableEntityError(ApiError):
+    def __init__(self, body: HttpValidationError):
+        super().__init__(status_code=422, body=body)