What does this ERROR message mean?

This error relates to the transaction log used for tracking the compaction status of a sstable. The log itself will be removed after the sstable completes the compaction and gets deleted.
The error represents an IOException thrown for failed or interrupted I/O operations

Why does this error occur?

This error occurs if the deletion of the compaction transaction log fails for an unknown reason.

How do you fix this ERROR?

To investigate further please contact Technical Support and provide a copy of the log containing the error and an ls -l output of the data directory referenced in the error.