[news.eclipse.newcomer] new PHP project creation error in PDT

[Raman <neothinkx@xxxxxxxxx>]

Hi

i recently made a switch to eclipse PDT from Aptana. 
but i am unable to create a new php project successfully.
when i start with general new project i have no issues but when i start with new php project  wizard and after typing new project's name i click next, next and then finish i get error message that 
"creation of element failed
Reason
Build path contains duplicate entry.
"

now if i go back and remove php language library from libraries, my project get created successfully.

why it is happening like that.

how and where i can edit preferences to prevent not including php language library twice.

thanks


Raman