free problem

[zOrP]

I´ve got quite an annoying problem.

At random, but about every 2. or 3. time i do
!df or !free, bot chrashes and spams this:

[13:38] [AlcoBot] Error :: ModFree - unable to retrieve volume information for "D:": The filename, directory name, or volume label syntax is incorrect.
[13:38] [AlcoBot] Error :: ModFree - unable to retrieve volume information for "K:": The filename, directory name, or volume label syntax is incorrect.

and i tried to change conf.

tried with
d:/ = section

and
d:\ = section

and
d: = section

No difference..

any ideas?