Bitcache tools path

hi all,

i hope it's the right board.
i installed bitcache and now, in the settings under bitcache tools there is a path given for executables.

sites/all/modules/bitcache/tools/bin/bit

but i have no path ./tools/bin/bit
when i try to upload a videofile like flv or whatever, i get this error:

   * warning: array_diff_key() [function.array-diff-key]: Argument #1 is not an array in /var/www/virtual/realfunclan-base.de/drup/htdocs/sites/all/modules/bitcache/bitcache.module on line 677.
    * warning: array_merge() [function.array-merge]: Argument #1 is not an array in /var/www/virtual/realfunclan-base.de/drup/htdocs/sites/all/modules/bitcache/bitcache.module on line 677.
    * warning: array_merge() [function.array-merge]: Argument #2 is not an array in /var/www/virtual/realfunclan-base.de/drup/htdocs/sites/all/modules/bitcache/bitcache.module on line 677.
    * recoverable fatal error: Argument 1 passed to Bitcache_FileRepository::__construct() must be an array, null given, called in /var/www/virtual/realfunclan-base.de/drup/htdocs/sites/all/modules/bitcache/bitcache.module on line 681 and defined in /var/www/virtual/realfunclan-base.de/drup/htdocs/sites/all/modules/bitcache/adapters/file.inc on line 13.
    * warning: array_merge() [function.array-merge]: Argument #2 is not an array in /var/www/virtual/realfunclan-base.de/drup/htdocs/sites/all/modules/bitcache/adapters/file.inc on line 21.
    * Das Verzeichnis ist nicht vorhanden.
    * warning: copy(/efe508c1ba3f442bd657ff283b4da4c1cd8de461) [function.copy]: failed to open stream: Permission denied in /var/www/virtual/realfunclan-base.de/drup/htdocs/sites/all/modules/bitcache/adapters/file.inc on line 163.
    * Error saving file Märchen.flv. Please, contact site administrator.
    * A file upload must be provided.

i follwed the install instructions and user permissions are enabled. should some files withim bitcache have higher permissions?
what do i wrong?