Rafi -
Verify that the directory C:\Program Files\National Instruments\Shared\Session Manager\ exists on your system. This is where the session manager is installed and you should find the file NISessionServer.dll. If it is there the file did not get registered. To fix this, using the command line prompt, enter:
"regsvr32.exe C:\Program Files\National Instruments\Shared\Session Manager\NISessionServer.dll"
This will register the DLL.
Scott Richardson
https://testeract.com