mem0ai/mem0 · error · ValueError

Payload count must match vector count. Expected {len(vectors

Error message

Payload count must match vector count. Expected {len(vectors)} got {len(payloads)}.

What it means

Error "Payload count must match vector count. Expected {len(vectors)} got {len(payloads)}." thrown in mem0ai/mem0.

Source

Thrown at mem0/vector_stores/oracledb.py:379

                    payload JSON
                )
                """
            )

            if self.config.do_create_index:
                ddl = self._create_index_ddl()
                cursor.execute(ddl)

    def insert(
        self,
        vectors: List[List[float]],
        payloads: Optional[List[Dict[str, Any]]] = None,
        ids: Optional[List[str]] = None,
    ) -> None:
        logger.info(f"Inserting {len(vectors)} vectors into collection {self.collection_name}")

        if payloads is not None and len(payloads) != len(vectors):
            raise ValueError(f"Payload count must match vector count. Expected {len(vectors)} got {len(payloads)}.")
        if ids is not None and len(ids) != len(vectors):
            raise ValueError(f"ID count must match vector count. Expected {len(vectors)} got {len(ids)}.")

        ids = ids or [str(uuid.uuid4()) for _ in vectors]
        data = [
            {"id": _id, "vector": array.array("f", vector), "payload": payload}
            for vector, payload, _id in zip(vectors, payloads or [{}] * len(vectors), ids)
        ]

        with self._get_cursor(commit=True) as cursor:
            cursor.setinputsizes(
                vector=oracledb.DB_TYPE_VECTOR,
                payload=oracledb.DB_TYPE_JSON,
            )
            cursor.executemany(
                f"INSERT INTO {self.collection_name} (id, vector, payload) VALUES (:id, :vector, :payload)", data
            )

View on GitHub (pinned to 001c235229)

Solutions

1. Pass one payload per vector so len(payloads) equals len(vectors).

When it happens

Trigger: Thrown at mem0/vector_stores/oracledb.py:379 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of mem0ai/mem0@001c235229 (2026-08-15). Data as JSON: /api/errors/1ed49122dbf4180a. Report an issue: GitHub.