This is my fisrt day playing Oolite and I found the game very interesting. Since I am a completely newbie, I followed the tutorial first flight to the Zaonce planet.
I got a problem, I guess since I haven't found what's wrong, so I will need some advices or suggestions

When you enter to the new planet system, the tutorial said to activate in-system jump by pressing the key "J". I should make the crosshair on the middle of the planet. I did all the steps to do it but, the jump don't work...
If I launch the jump, I got a message saying "Hyper mass-locked" and then nothing. Does it mean something is between the ship and the planet? I am in normal speed, the compass is good and the view in the right way...
The tutorial doesn't help too much about this situation. Any ideas??
Thx