# Type Alias GraphCompileError

GraphCompileError:
| { type: "duplicate_node"; nodeId: string }
| { type: "missing_node"; nodeId: string; referencedBy: string }
| { type: "cycle_detected"; path: readonly string[] }
| { type: "no_entry"; message: string }
| { type: "unreachable_node"; nodeId: string }
| { type: "missing_reducer"; field: string }

Error type for graph compilation failures.

- Defined in packages/nexus-agents/src/orchestration/graph/graph-types.ts:392