I have build serveral characters and made 2 careers and didnt come cross that error.
But, it is posible that you didnt have found the last of the turrets, they are hidden well and the shipscanner does not show you the next or nearest waspoint you can find stuff needed for your mission as it does in a groundmission (In a groundmission the scanner will show you crates, anomalies and mission-waypoints).
In some space-missions the scanner works on anomalies and waypoints in some missions it only works on anomalies.
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But, it is posible that you didnt have found the last of the turrets, they are hidden well and the shipscanner does not show you the next or nearest waspoint you can find stuff needed for your mission as it does in a groundmission (In a groundmission the scanner will show you crates, anomalies and mission-waypoints).
In some space-missions the scanner works on anomalies and waypoints in some missions it only works on anomalies.