If possible, consider upgrading to a newer version of OCSM (5.x) or switching to NetApp Active IQ Unified Manager, which supports ONTAP 9.x legacy clusters better.
: Some legacy documentation for this tool is still hosted by IBM Support for their rebranded N series versions. NetApp Community Key Features of Version 3.1.3 netapp oncommand system manager 3.1.3 download
After downloading OnCommand_System_Manager_3.1.3_x64.zip , validate using the official checksums. If possible, consider upgrading to a newer version