An error occurred while trying to write data copied from a file created by a build job that was run by an agent on the same host as emake itself to a file in emake’s own backing store. The path in the error message indicates the specific path, which will be a temporary file inside emake’s backing store. The OS error message provides the specific cause of the failure.
Because the error involves an external system in this context (the filesystem on the emake host), the list of possible causes for this error is virtually limitless: a corrupted filesystem; hardware failure; insufficient permissions; and so on. Refer to the specific OS error message to determine the cause of the failure.