Unable to load time source driver sntp

Hi ,
I added sntp client script in ni-rt.ini file. but i am getting the following error. Do i have to install something. if sowhat is the driver needs to be installed.
"unable to load time source driver"
thank you,
Ranjith

Hi,
I need to sync RT PXI chassis time with remotely located unix PC which is running NTP server.
Any help would be appriciated.
Ranjith

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