🐛 fix(chat.py): yield error message when an exception occurs during stream_build

🔧 chore(base.py): fix typo in docstring
The fix in chat.py ensures that an error message is yielded when an exception occurs during stream_build. This helps to provide more information to the client-side when an error occurs. The typo in base.py's docstring is fixed to improve readability.

src/backend/langflow/api/v1/chat.py

@@ -107,8 +107,9 @@ async def stream_build(flow_id: str):
                 yield f"data: {response}\n\n"
 
             chat_manager.set_cache(flow_id, graph.build())
-        except Exception:
+        except Exception as exc:
-            logger.error("Error while building the flow")
+            logger.error("Error while building the flow: %s", exc)
+            yield f"data: {json.dumps({'error': str(exc)})}\n\n"
         finally:
             yield f"data: {final_response}\n\n"
 

src/backend/langflow/graph/graph/base.py

@@ -10,6 +10,7 @@ from langflow.graph.vertex.types import (
 )
 from langflow.interface.tools.constants import FILE_TOOLS
 from langflow.utils import payload
+from langflow.utils.logger import logger
 
 
 class Graph:
@@ -30,7 +31,7 @@ class Graph:
         Creates a graph from a payload.
 
         Args:
-            payload (Dict): The payload to create the graph from.
+            payload (Dict): The payload to create the graph from.˜`
 
         Returns:
             Graph: The created graph.