adding sounds issue

[Wrestler 0]

Ive got an issue when I am trying to add a sound as a new "unit" (Class: Sounds) in mission editor. It comes with error message:

No entry 'bin\config.bin/CfgFactionClasses.-1'.

Then when i start the mission, sometimes the sound works, sometimes doesn't (i don't know if it's a bug or a purpose).

Furthermore, when I select the sound "Vytí psa" (in czech version, i don't know the exact english translation, maybe "Sorrow dog"), after starting the mission there appears another error message:

SFX SorrowDogSfx not found

(game version is 1.02.58134)

[JDog 11]

Is it because you're using "/" instead of "\"?

[Wrestler 0]

Is it because you're using "/" instead of "\"?

i am not using anything, no script, even no init command, the error message appears unreasonably

[Wrestler 0]

In 1.03, it seems like the first error message disappeared, but the missing "Sorrow dog" sound issue remains.