enable debug mode to see the actual error and copy it here

already did and it say this

Message:username is not a member of the user table.File:/home/blackdbs/public_html/ow_libraries/facebook/base_facebook.php

Line:1254

Trace:#0 /home/blackdbs/public_html/ow_libraries/facebook/base_facebook.php(821): BaseFacebook->throwAPIException(Array) #1 /home/blackdbs/public_html/ow_libraries/facebook/base_facebook.php(652): BaseFacebook->_restserver(Array) #2 /home/blackdbs/public_html/ow_plugins/fbconnect/bol/service.php(164): BaseFacebook->api(Array) #3 /home/blackdbs/public_html/ow_plugins/fbconnect/bol/service.php(185): FBCONNECT_BOL_Service->fbGetFieldValueList('236093223267373', Array) #4 /home/blackdbs/public_html/ow_plugins/fbconnect/controllers/connect.php(81): FBCONNECT_BOL_Service->requestQuestionValueList('236093223267373') #5 [internal function]: FBCONNECT_CTRL_Connect->login(Array) #6 /home/blackdbs/public_html/ow_core/request_handler.php(266): ReflectionMethod->invokeArgs(Object(FBCONNECT_CTRL_Connect), Array) #7 /home/blackdbs/public_html/ow_core/application.php(330): OW_RequestHandler->dispatch() #8 /home/blackdbs/public_html/index.php(65): OW_Application->handleRequest() #9 {main}
Type:FacebookApiException

Sorry ross , I just copy and paste it above and it's seem not organized , See this attachment for better , 

Have you made any changes in section of the profile questions synchronization? Please provide a screenshot of that section 

Oh okay ross , I already fixed it , thank you so much . 

alright, I'm going to mark this post as Solved. 

Ok thanks , you really are great Helper , Thumbs Up for you ross.  

POST YOUR SOLUTION THAT FIXED THE ISSUE!!!!!!! Everyone comes here for help, but when the person figures out the solution they keep it to themselves.... that is selfish and inconsiderate.  

Tim do you experience the same issue?

Sorry i already forgot how to fix the issue ,I will tell here later . so sorry .