BP_Projectile & BP_Cannon failed to save

Hi at this stage of the course (last lecture of crystal cavern) whenever I try to make small changes in projectile and cannon (like change in color, for instance), it gives me an error before saving the game (screenshots attached). Hence I cannot modify these two objects… Any particular reason why this is happening
Secondly, if I have to create a hole in a pipe or a box, do I have to use subtract tool box everytime ? whenever I try to use delete (from edit section), it removes all the adjacent surfaces…


#Solved
Apparently, there were multiple Unreal Engine apps running in the task manager and creating some sort of glitch. As soon as I closed them, the problem got fixed.
For the second problem, I found the hollow tick option (:face_with_hand_over_mouth:)

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