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I'm attempting to create a new custom list in SharePoint 2019 by clicking on the "add an app" option. However, the process is stuck on loading and does not display the interface for creating a new custom list. What could be causing this issue, and how can it be resolved?

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Solving: Add an App Stuck on Loading in SharePoint 2019

In SharePoint, The "Add an App Stuck on Loading" problem may occur due to the following reasons:

  • You might have a system custom master page in which certain placeholders were deleted or had their visibility set to false.
  • The app installation service timer job is disabled.

    Add an App Stuck on Loading in SharePoint 2019

To troubleshoot and solve the issue, you have to do the following:

  1. Revert the current master page to the default, non-customized version in order to load your Apps correctly.
  2. Alternatively, if you choose to retain your custom master page, ensure that any missing placeholders are added, as mentioned at Add an App Stuck on Loading in SharePoint 2013
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