problem with load library

[eluser]umefarooq[/eluser]
then check the permission of your library folder is it fine or not do you have right to read and write from that folder

[eluser]674DBK[/eluser]
i check on system/application/libraries/ , that folder permission read and write..also did not work..

when i place Tank_Auth.php and phpass-0.1 in system/libraries

i got error like this

Fatal error: Cannot redeclare class PasswordHash in /home/dbk6/kpe/system/application/libraries/phpass-0.1/PasswordHash.php on line 27

now i confuse.. CI read library from /system/libraries/ OR /system/application/libraries/ because after i m place in /system/libraries/ .. CI work and got error as above

[eluser]674DBK[/eluser]
anyone...??????