Oracle Message ORA-15014 - path string is not in the discovery set

ERRORpath string is not in the discovery set
CAUSEThe operating system path specified was outside the set of disks that are discovered by the instance.
ACTIONSpecify a operating system path within the set of disks that are discovered based upon the ASM_DISKSTRING parameter. Alternatively, check the setting of the ASM_DISKSTRING parameter.