ST-LINK V2: Command line HALT DOESN'T WORK

Hi, I'm developping a VI in Labview to interface with ST-LINK V2 using "ST-LINK_CLI.exe" and programming ST micro . I'm able with my VI to program micro, write and read byte but when I use the command -halt to halt the core it doesn't work and I receive the message "unexpected error" (see the image). If I try to halt the core by the STM32 ST-LINK UTILITY, so using the ST GUI the halt of the core happens correctly.

Thanks for your support