Android InApp Purchase issue (-1002: Bad Response recieved) -

i have app iap implemented , works fine of time. however, installations reporting -1002 error code iabhelper (which not documented anywhere). here's logs tell me (this happens right after user returns google play):

2013-05-03 11:40:03,781 774539 [main] error: in-app billing error: null data in iab activity result.  2013-05-03 11:40:03,786 774544 [main] debug: purchase finished: iabresult: null data in iab result (response: -1002:bad response received), purchase: null  2013-05-03 11:40:03,803 774561 [main] error: error purchasing: iabresult: null data in iab result (response: -1002:bad response received) 

can tell me why error -1002 occurs?

is problem google play or client implementation?

thanks

i had same problem when in-app billing in fragment, solved solved moving activity.