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did you try to wrap your code in a try catch block? try { .. }catch (Exception ex) { ROS_INFO("%s" , ex.what()); }

did you try to wrap your code in a try catch block? block?

try
{
..
}catch }
catch (Exception ex)
{
 ROS_INFO("%s" , ex.what());
}
ex.what())
}

did you try to wrap your code in a try catch block?

try
{
..
}
catch (Exception ex)
{
try: 
 ROS_INFO("%s" , ex.what())
}
..
catch Except as ex:
   rospy.loginfo(ex.message)

did It may be a timeout exception: Are you sure that the required transform tree is being broadcasted periodically?

Did you try to wrap your code in a try catch block?

try: 
   ..
catch Except as ex:
   rospy.loginfo(ex.message)