OAuthException while posting action - action

Question

I am trying to post an action using the following javascript code:
FB.api('/me/spacemaze:fly_through',
'post',
{maze: 'http://www.gethugames.in/html5spacemaze/', lid: state.currentLevel, score: 1001},
function(resp) {
if(!resp || resp.error) {
console.log('err occured');
console.log(resp.error);
} else {
console.log('successfull action');
console.log(resp);
}
});
But the request fails and get the following error:
code: 1
message: "An unknown error has occurred."
type: "OAuthException"
in Open Graph Dashboard, fly_through is defined as an action with 2 custom properties lid and score of float type. Maze is an Object and I havent created any aggregations.
What is wrong with my code?
EDIT 1:
I got an access token, verified it to be valid in access token debugger, but Issues field says unknown. Not sure if that is a problem.
Then in Graph API Explorer, I posted a query with following fields
URL: me/spacemaze:fly_through
maze: http://www.gethugames.in/html5spacemaze
lid: 5
score: 10.1
but getting the same error:
"error": {
"message": "An unknown error has occurred.",
"type": "OAuthException",
"code": 1
}
PS: I got permissions for publish_stream and read_stream under extended permissions. Isnt it suffice?