### **Steps to reproduce**

1. Start openproject in development environment

2. Open one of the pages:

1. /lookbook/inspect/primer/alpha/toggle\_switch/playground

2. /lookbook/inspect/primer/beta/auto\_complete/playground

3. /lookbook/inspect/primer/forms/auto\_complete\_form

4. /lookbook/inspect/primer/forms/immediate\_validation\_form Begin of the insertion

5. /lookbook/inspect/primer/open\_project/tree\_view/playground

6. /lookbook/inspect/primer/open\_project/tree\_view/loading\_failure

7. /lookbook/inspect/primer/open\_project/tree\_view/loading\_skeleton

8. /lookbook/inspect/primer/open\_project/tree\_view/loading\_spinnerEnd of the insertion


### **What is the buggy behaviour?**

* There is an error for undefined path in Primer::UrlHelpers


### **What is the expected behavior?**

1. All previewes should work