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Use this tag when referring to this error id in ArcGIS.

Description

A lock commonly means that another application is accessing a database, and the ability to alter its structure, such as by adding or removing fields, is restricted. A common cause for a schema lock is displaying a dataset in ArcMap while trying to modify the dataset in another application.

Solution

If using multiple applications, check whether those applications might be accessing the same data.

http://pro.arcgis.com/en/pro-app/tool-reference/tool-errors-and-warnings/001001-010000/tool-errors-and-warnings-00601-00625-000601.htm