Premiere Pro CC 2018 does not launch customized workspaces

When opening up a custom workspace created in Premiere Pro CC 2018, the workspace does not launch and an empty workspace window appears.

This issue can be related to corrupted workspaces.

To reset the settings, follow the steps below:

Go to the following location in the machine

In Windows, C:\Users\UserName\Documents\Adobe\Premiere Pro\12.0

In Mac, Documents > Adobe > Premiere Pro > 12.0

Rename the 12.0 folder to Old_12.0

Launch Premiere Pro and create a project. Do not open old projects.

In menu bar, Window > Workspace > Uncheck Import Workspace from Projects.

Open the old project & check the issue.

Environment