I am also getting same error with v2.0.8. i already created a thread on this forum. below is the detail for your info.
I am new to this forum. i have installed a2billing v2.0.8 on centos 6.5. Everything works good except a strange problem in delete function. I am not able to delete anything (eg. a customer, a rate, a trunk, whatever it is). i can create or modify these but whenever i am trying to delete anything it gives me an error 'ASK-DONE'. any help will be highly appreciated.
please find the attached screenshot or below link what exacly I am getting when i click on delete button in a2billing web interface.http://www.screencast.com/t/dK2567C6Od