⚠️ Error Message

Link between ... and ... has invalid state
          

📌 Causes

This error occurs because:

➡️ Meta-data between assemblies is not synchronized

It means:

• Field structure (name, quantity, data type) from the previous assembly
• Incompatible with the following assembly

🧠 Case Example

For example:

Transformer_1 produces:

    video_id, title, views (Integer)

But Filter_1 or Transformer_2 expects:

    video_id, title, views (String)

➡️ Then an error will appear:

    Link between Transformator_1 and Filter_1 has invalid state  

🎯 Common Causes

• Add/remove fields but don't propagate
• Changing data type (String → Integer)
• Deleting the link then not resyncing
• Copy workflow but metadata not updated

✅ Solution (Most Important)

🔧 Use the ☑ button (Propagate Meta-data) Steps:

1. Click on the assembly that has the error
2. Click the ☑ (Propagate Meta-data) icon in the toolbar
   
   
   
3. Go to the next assembly
4. Repeat until the ☑ button is disabled.