There is not enough disk space to finish building the locator.
In most cases, disk space should be 3 to 4 times the size of the original reference data. However, in cases with large data, many roles, and many custom output fields, it can require up to 40 times the reference data size to build successfully.
Do one or more of the following to resolve the error if the locator failed to build:
- Compare the available system resources with the minimum system requirements for ArcGIS Pro.
- Run Windows utility Disk Cleanup.
- Uninstall unused applications.