# The Call Stack Panel

> Call Stack panel that displays the next activity to execute and its parent containers when a workflow is paused during debug mode.

The **Call Stack** panel displays the next activity to be executed and its parent containers when the project is paused in debugging.

The panel is displayed during execution in debug mode and it gets populated after using **Step Into**, **Break**, **Slow Step**, or after the execution was paused because an error or a breakpoint was encountered.

![Call Stack panel listing the current Log Message activity and its parent Sequence, with their activity types and file paths](https://dev-assets.cms.uipath.com/assets/images/studio/the-call-stack-panel-call-stack-4c2403fa.webp)

Double-clicking an item in the **Call Stack** panel, focuses and highlights the selected activity in the **Designer** panel.

If during debugging, an activity throws an exception, it is marked in the **Call Stack** panel and the activity is highlighted in red.