Question: I want to add dynamic rows with a dropdown field.how to add into the catalog product insert area thanks in a advance.

[![enter image description here](https://i.stack.imgur.com/0zc3B.png)](https://i.stack.imgur.com/0zc3B.png)

Answer: 
Missing di.xml `preference` issue.

---

> 
> app/etc/di.xml
> 
> 
> 

```
<preference for="Magento\Framework\Search\Request\IndexScopeResolverInterface" type="Magento\Framework\Indexer\ScopeResolver\IndexScopeResolver"/>

```
Had this issue as well. It got fixed in 2.2.6 release. 

[![enter image description here](https://i.stack.imgur.com/AkXsa.png)](https://i.stack.imgur.com/AkXsa.png)