FlowiseAI/Flowise · error · Error

Model is required

Error message

Model is required

What it means

ConditionAgent.run requires nodeData.inputs.conditionAgentModel to be truthy; it is the component-node key used to import and instantiate the underlying LLM. Thrown before any LLM setup, so the node cannot run without a selected model.

Source

Thrown at packages/components/nodes/agentflow/ConditionAgent/ConditionAgent.ts:260

                throw new Error(`Invalid JSON object. Error: ${error}`)
            }
        }

        throw new Error('Could not find JSON block in the output.')
    }

    async run(nodeData: INodeData, question: string, options: ICommonObject): Promise<any> {
        let llmIds: ICommonObject | undefined
        let analyticHandlers = options.analyticHandlers as AnalyticHandler

        try {
            const abortController = options.abortController as AbortController

            // Extract input parameters
            const model = nodeData.inputs?.conditionAgentModel as string
            const modelConfig = nodeData.inputs?.conditionAgentModelConfig as ICommonObject
            if (!model) {
                throw new Error('Model is required')
            }
            const modelName = modelConfig?.model ?? modelConfig?.modelName

            const conditionAgentInput = nodeData.inputs?.conditionAgentInput as string
            let input = conditionAgentInput || question
            const conditionAgentInstructions = nodeData.inputs?.conditionAgentInstructions as string
            const conditionAgentSystemPrompt = nodeData.inputs?.conditionAgentSystemPrompt as string
            const conditionAgentOverrideSystemPrompt = nodeData.inputs?.conditionAgentOverrideSystemPrompt as boolean
            let systemPrompt = NodeHtmlMarkdown.translate(CONDITION_AGENT_SYSTEM_PROMPT)
            if (conditionAgentSystemPrompt && conditionAgentOverrideSystemPrompt) {
                systemPrompt = conditionAgentSystemPrompt
            }

            // Extract memory and configuration options
            const enableMemory = nodeData.inputs?.conditionAgentEnableMemory as boolean
            const memoryType = nodeData.inputs?.conditionAgentMemoryType as string
            const _conditionAgentScenarios = nodeData.inputs?.conditionAgentScenarios as { scenario: string }[]

View on GitHub (pinned to abe4a8601a)

Solutions

1. Open the Condition Agent node and select a model, then save.
2. Set inputs.conditionAgentModel programmatically to a valid component node name.
3. Confirm the referenced model still exists in componentNodes at runtime.
4. Validate saved flow JSON for a non-empty conditionAgentModel before deploy.

Example fix

// before
inputs.conditionAgentModel = ''

// after
inputs.conditionAgentModel = 'chatOpenAI'
inputs.conditionAgentModelConfig = { model: 'gpt-4o-mini', modelName: 'gpt-4o-mini' }

function ensureConditionAgentModel(nodeData, componentNodes) {
  const m = nodeData.inputs?.conditionAgentModel
  if (!m || !componentNodes?.[m]) {
    throw new Error('Condition Agent requires a valid conditionAgentModel')
  }
}

function hasConditionAgentModel(nodeData, componentNodes) {
  const m = nodeData?.inputs?.conditionAgentModel
  return typeof m === 'string' && m.length > 0 && !!componentNodes?.[m]
}

if (!hasConditionAgentModel(nodeData, options.componentNodes)) {
  // surface UI error, skip
} else { await conditionAgent.run(nodeData, question, options) }

When it happens

Trigger: Condition Agent node saved without a model; flow JSON with conditionAgentModel stripped; programmatic nodeData missing the field; referenced model node deleted from the project.

Common situations: Newly added Condition Agent with the model dropdown left empty; imported template missing the field; model component renamed/removed; UI not persisting the selection.

Related errors

• Model is required
• Scenarios are required
• Invalid JSON in executeFlowOverrideConfig: ${parseError.mess
• Invalid base URL: must be a valid URL
• Cannot call the same agentflow!

AI-assisted analysis of FlowiseAI/Flowise@abe4a8601a (2026-08-12). Data as JSON: /api/errors/3d634d3338bcbd56. Report an issue: GitHub.