Win Bench 96 error with insufficient free disk space

Hello,
I have almost 120 GB free space in drive F and I have this error when I want to run a test. I think 120GB free space is enough space for any test and I am thinking that might be an error of the program. Can anyone tell me what is happening ?
Thank you !

WinBench 96 Version1.0
WinBench 96 has found insufficient free disk space on drive F: to run this test.
You need approximately -663845296 additional bytes to run the test.
