OpenBMB/ChatDev · error · ValueError

Unsupported node type: {node_type}

Error message

Unsupported node type: {node_type}

What it means

create_executor looks up node_type in the registry of node registrations (iter_node_registrations()); an unknown type has no builder and raises ValueError.

Source

Thrown at runtime/node/executor/factory.py:56

    ) -> NodeExecutor:
        """Create an executor for the requested node type.
        
        Args:
            node_type: Registered node type name
            context: Shared execution context
            subgraphs: Mapping of subgraph nodes (used by Subgraph executors)
            
        Returns:
            Executor instance for the requested type
            
        Raises:
            ValueError: If the node type is not supported
        """
        subgraphs = subgraphs or {}
        
        registrations = iter_node_registrations()
        if node_type not in registrations:
            raise ValueError(f"Unsupported node type: {node_type}")
        return registrations[node_type].build_executor(context, subgraphs=subgraphs)

View on GitHub (pinned to 4fb2db0ea9)

Solutions

1. Print sorted(iter_node_registrations().keys()) and fix node_type to a registered value
2. Import/register your custom node registration before creating executors
3. Upgrade the runtime to the version that supports the node type

Example fix

# before
create_executor(ctx, node_with_type('Agnet'))

# after
create_executor(ctx, node_with_type('agent'))

from runtime.node.executor.factory import iter_node_registrations
if node.node_type not in iter_node_registrations():
    raise ValueError(f'unknown type {node.node_type}; known: {sorted(iter_node_registrations())}')

def is_supported_node_type(t: str) -> bool:
    return t in iter_node_registrations()

When it happens

Trigger: Calling create_executor with node.node_type not among registered types, e.g. a typo like 'agnt' or a custom type whose registration module was never imported.

Common situations: Loading a saved workflow from a newer runtime version with new node types into an older runtime; custom node plugins not registered at startup; serialized typo in node_type.

Related errors

• unsupported memory store type '{store_type}'
• unsupported node type '{node_type}'
• Entry '{name}' is not a BaseConfig subclass
• tooling.type must be one of {list(iter_tooling_type_registra
• Edge condition type '{name}' already registered

AI-assisted analysis of OpenBMB/ChatDev@4fb2db0ea9 (2026-08-27). Data as JSON: /api/errors/6f06dd1de5d4cc39. Report an issue: GitHub.