some error with Command-Line tool

Hello Acronis Team

We've got here a test system to try out the Acronis Backup Advanced 11.5, but there is an error with the Command Line Tool.

Warning: The versions of the command-line tool (11.5.0.43994) .

acrocmd mount --loc=E:\backups --arc=back.tib --backup=69EA506F-9E05-E52A-C5F7-BDEC9B736437 --volume=1-1 --letter=K
An error occurred while executing the command.
    Error: 0x1510008
    $module = "acrocmd_vs_43994"
    Tag: 0x7A8E520180FDC065
Failed to find disk ID by the disk's number.
    Error: 0x1510021
    $module = "abr11cli_vs_43994"
    Tag: 0x62341FC67DE01170