Update Manager JFolder::create: Could not create directory - Joomla! Forum - community, help and support

i trying update latest version. installed update manager. these results when have run following steps:

joomla! update manager - step 1

you running 1.5.12. latest release 1.5.15. please select download:

joomla! update manager - step 2

the file 'joomla_1.5.12_to_1.5.15-stable-patch_package.tar.gz' has been downloaded http://joomlacode.org/gf/download/frsre ... age.tar.gz.

if want use method, can proceed install >>>

joomla! update manager - step 3



* jfolder::create: not create directory
* unable create destination

any ideas doing wrong?

i no longer need information

uninstalled update manager , updated joomla manually.