solve the “undefined variables ‘context’” problem

metagpt/actions/action_node.py

@@ -597,8 +597,9 @@ async def xml_fill(self, context: str, images: Optional[Union[str, list[str]]] =
     async def fill(
         self,
         *,
-        req,
         llm,
+        context=None,
+        req=None,
         schema="json",
         mode="auto",
         strgy="simple",
@@ -609,7 +610,7 @@ async def fill(
     ):
         """Fill the node(s) with mode.
 
-        :param req: Everything we should know when filling node.
+        :param context: Everything we should know when filling node.
         :param llm: Large Language Model with pre-defined system message.
         :param schema: json/markdown, determine example and output format.
          - raw: free form text
@@ -628,6 +629,10 @@ async def fill(
         :return: self
         """
         self.set_llm(llm)
+        if not req and context:
+            req = context
+        if not context and req:
+            context = req
         self.set_context(req)
         if self.schema:
             schema = self.schema