I've run Onyx 3.1.7 and received the following disk structure error:
Error: -69845: File system verify or repair failed
Underlying error: 8: POSIX reports: Exec format error
The disk needs to be repaired.
I've rebooted system in recovery mode and attempted to run the First Aid with use of the Disk Utility, however, after rebooting and running Onyx again I've arrived at the same error. The System is running on el-capitan with 500GB flash storage.