> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Why is there an error beside certain property chips?

## Question:

Why is there an error beside certain property chips when I run my block?

## Applies to:

* User interface

## Answer:

Sometimes, when you run a block and open up the Info panel, there are red error markings beside certain property chips. This error is alerting you that the property is **empty** and won't have any output. If you were to use that property chip, the error would come with it and there would be no output.

For example, a **Topology Optimization** block doesn't have an associated temperature, therefore, the temperature property chip that builds with the block is empty and gives you the error: Incorrect units to use property.

![Sometimes blocks have a placeholder property chip even though they don't have associated values for that property. This image shows how the temperature property chip of a Topology Optimization yields the incorrect units to use property error. This is because Topology Optimizations don't use temperature values.](https://files.learn.ntop.com/help-articles/user-interface/49669230656659.png)## More on this topic:

* [Get to know the User Interface](https://support.ntop.com/hc/en-us/articles/360046004994)
* [How do I access block properties and info?](/help-articles/knowledge-base/user-interface/how-do-i-access-block-properties-and-info)
* [How do I get a scalar variable from a math block instead of a scalar field?](/help-articles/knowledge-base/user-interface/how-do-i-get-a-scalar-variable-from-a-math-block-instead-of-a-scalar-field)

## Keywords:

*error property question empty output units chips incorrect*