{"action":"opened","issue":{"url":"https://api.github.com/repos/ROBOTIS-GIT/turtlebot3_autorace/issues/21","repository_url":"https://api.github.com/repos/ROBOTIS-GIT/turtlebot3_autorace","labels_url":"https://api.github.com/repos/ROBOTIS-GIT/turtlebot3_autorace/issues/21/labels{/name}","comments_url":"https://api.github.com/repos/ROBOTIS-GIT/turtlebot3_autorace/issues/21/comments","events_url":"https://api.github.com/repos/ROBOTIS-GIT/turtlebot3_autorace/issues/21/events","html_url":"https://github.com/ROBOTIS-GIT/turtlebot3_autorace/issues/21","id":343603640,"node_id":"MDU6SXNzdWUzNDM2MDM2NDA=","number":21,"title":"Bad callback errors occurred while detecting the lane, traffic sign, traffic light, etc.","user":{"login":"wsung1","id":26803880,"node_id":"MDQ6VXNlcjI2ODAzODgw","avatar_url":"https://avatars1.githubusercontent.com/u/26803880?v=4","gravatar_id":"","url":"https://api.github.com/users/wsung1","html_url":"https://github.com/wsung1","followers_url":"https://api.github.com/users/wsung1/followers","following_url":"https://api.github.com/users/wsung1/following{/other_user}","gists_url":"https://api.github.com/users/wsung1/gists{/gist_id}","starred_url":"https://api.github.com/users/wsung1/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/wsung1/subscriptions","organizations_url":"https://api.github.com/users/wsung1/orgs","repos_url":"https://api.github.com/users/wsung1/repos","events_url":"https://api.github.com/users/wsung1/events{/privacy}","received_events_url":"https://api.github.com/users/wsung1/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2018-07-23T12:01:38Z","updated_at":"2018-07-23T12:01:38Z","closed_at":null,"author_association":"NONE","body":"Hi, ROBOTIS!\r\nI'd thank you guys for such a great challenge you made!\r\nNow I'm working on turtlebot3_autorace packages with following their tutorials (http://emanual.robotis.com/docs/en/platform/turtlebot3/autonomous_driving).\r\nNothing went wrong up to Tutorials: 4. Calibration.\r\nHowever, from Tutorials: 5. Missions I've bumped into bad callback errors that look alike as follows.\r\n\r\n5.1. Lane Detection\r\n![image](https://user-images.githubusercontent.com/26803880/43074922-f1fc2500-8eb9-11e8-8e05-2da33b6a9211.png)\r\n\r\n5.2. Traffic Sign\r\n![image](https://user-images.githubusercontent.com/26803880/43074944-0771f8c4-8eba-11e8-9fc3-cb24a9eaf1d8.png)\r\n\r\n5.3. Traffic Light\r\n![image](https://user-images.githubusercontent.com/26803880/43074954-0f4cc6dc-8eba-11e8-9ad7-8529870a2fdd.png)\r\n\r\n5.4. Parking Lot\r\n![image](https://user-images.githubusercontent.com/26803880/43074961-1572df92-8eba-11e8-8bcd-68a26aabb9a3.png)\r\n\r\nDo they mean that the callback function is not called because the message doesn't arrive at?\r\nPlease advise me how to approach this problem.\r\nThank you in advance!"}}
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