What does "Invalid cross-device link" mean when encountered within the same docker volume?

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"Invalid cross-device link" is an error message that indicates that the link operation failed because the source and destination of the link are located on different filesystems or devices. Within the context of Docker volumes, this means that the source and destination directories are not on the same volume, so they cannot be linked together. This error typically occurs when trying to link directories across different mount points or file systems, so it's important to make sure that all directories being linked are located on the same volume before attempting to create a link.