> For the complete documentation index, see [llms.txt](https://docs.langstack.com/welcome/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.langstack.com/welcome/get-started/learn-langstack/basics-and-essentials/what-is-an-action/error-propagation.md).
# Error propagation
* Error propagation alerts the users about the error(s) in the application.
* The error(s) may be in the individual fields, sections, functions, Action boxes, Actions, and Container Actions.
* There are three (3) main types of error propagation. These are denoted by the following icons:
* : There is a problem in the section/function/field. (contains elements having a problem)
*  : There is a problem with elements inside this element displaying this icon. (contains elements that are having a problem)
* : There is a problem with the element displaying the icon. (is problematic itself)
* When the user clicks on the icon, the tooltip explains the potential problem area.
### Example
The error propagation icons are explained through the following illustration of the error propagation in the “On Skipped record” section in an ETL pipeline:
* The (icon) says that there is a problem within the “On Skipped record” function.
* The icon says there is no problem with the Action box, but there is a problem with an Action within the Action box.
* The icon says there is a problem with the element displaying the icon.
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