I've finished a relocation assignment for settlers by my crew but I'm unable to collect my reward; it states that I have to little space on my ship. Unfortunally ofcourse. But now I've already (just wasn't paying attention I gues) tried the assignment 4 times and 4 times the same result. I am also not able to free my crew who where working on this assignments. And as a result I'm not able to re-assign them; some new assignments I now cannot do because of the lack of availble crew.
What can I do to free up some room or to cancel the assigments to free up my crew?