Invalid url when Call n8n Workflow Tool used tutorial https://docs.n8n.io/advanced-ai/intro-tutorial/

[eusoubrasileiro]

Bug Description

After installing the n8n docker image like bellow on

Execution mode

sudo docker run -it --name n8n --restart always   -p 5678:5678   -v ~/n8n_data:/home/node/.n8n docker.n8n.io/n8nio/n8n

Then I was following the tutorials.

I did the long tutorial for testing.
Then I went to the build AI workflow in n8n
Everything was going fine... then this bellow can't work.
I found this discussion here pretty similar.
It seems the error is also happening on the cloud version (not deprecated)

No solution so far.

Using 1.75.2 and tested also on 1.68 docker image suggested by @Jon but… same error.

More details bellow

{
"errorMessage": "Invalid URL",
"errorDetails": {
"rawErrorMessage": [
"Invalid URL"
],
"httpCode": "none"
},
"n8nDetails": {
"nodeName": "Call n8n Workflow Tool",
"nodeType": "@n8n/n8n-nodes-langchain.toolWorkflow",
"nodeVersion": 1.2,
"itemIndex": 0,
"runIndex": 0,
"time": "1/23/2025, 11:07:38 AM",
"n8nVersion": "1.75.2 (Self Hosted)",
"binaryDataMode": "default",
"stackTrace": [
"NodeApiError: Invalid URL",
" at RoutingNode.runNode (/usr/local/lib/node_modules/n8n/node_modules/n8n-core/dist/RoutingNode.js:159:23)",
" at WorkflowExecute.runNode (/usr/local/lib/node_modules/n8n/node_modules/n8n-core/dist/WorkflowExecute.js:683:23)",
" at /usr/local/lib/node_modules/n8n/node_modules/n8n-core/dist/WorkflowExecute.js:890:51",
" at /usr/local/lib/node_modules/n8n/node_modules/n8n-core/dist/WorkflowExecute.js:1224:20"
]
}
}

Thanks a lot for any help!

To Reproduce

Hit Test workflow on the node Call n8n Workflow Tool

Expected behavior

Call n8n Workflow tool node would call the other workflow that would generate a list of fruits and colors.
It was created exactly according the tutorial copying the json and even from zero adding one by one.

Operating System

Ubuntu 24.04.1 LTS

n8n Version

1.75.2

Node.js Version

1.2

Database

SQLite (default)

Execution mode

own (deprecated)

[Joffcom]

Hey @eusoubrasileiro,

We have created an internal ticket to look into this which we will be tracking as "N8N-8216"