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can't spawn model in gazebo

hello everyone , i start gazebo with "$ roscore & $ rosrun gazebo_ros gazebo" , then i want to add a coke_can to it , and i type: "$ rosrun gazebo_ros spawn_model -database coke_can -gazebo -model coke_can -y 1 " but nothing happen in gazebo world . and the info in my terminate is below : spawn_model script started Deprecated: the -gazebo tag is now -sdf [INFO] [WallTime: 1420599431.921951] [0.000000] Loading model xml from Gazebo Model Database [INFO] [WallTime: 1420599431.922563] [0.000000] Waiting for service /gazebo/spawn_sdf_model [INFO] [WallTime: 1420599431.925847] [0.000000] Calling service /gazebo/spawn_sdf_model [INFO] [WallTime: 1420599441.933129] [619.918000] Spawn status: SpawnModel: Model pushed to spawn queue, but spawn service timed out waiting for model to appear in simulation under the name coke_can if anyone know , please tell me , thx~

can't spawn model in gazebo

hello everyone , i start gazebo with "$ $ roscore & $ rosrun gazebo_ros gazebo" gazebo, then i want to add a coke_can to it , and i type: "$ $ rosrun gazebo_ros spawn_model -database coke_can -gazebo -model coke_can -y 1 "1 but nothing happen in gazebo world . and the info in my terminate is below :

spawn_model script started
 Deprecated: the -gazebo tag is now -sdf
 [INFO] [WallTime: 1420599431.921951] [0.000000] Loading model xml from Gazebo Model Database
 [INFO] [WallTime: 1420599431.922563] [0.000000] Waiting for service /gazebo/spawn_sdf_model
 [INFO] [WallTime: 1420599431.925847] [0.000000] Calling service /gazebo/spawn_sdf_model
 [INFO] [WallTime: 1420599441.933129] [619.918000] Spawn status: SpawnModel: Model pushed to spawn queue, but  spawn service timed out waiting for model to appear in simulation under the name coke_cancoke_can

if anyone know , please tell me , thx~thx