Hi
From what is visible in your posted images, you seem to have some 28 video tracks running from only 17 clips. (Audio tracks are not visible but I assume there are a similar number). This seems to be a lot. VP is supposed to be able to cope with multiple tracks but there was a similar problem recently due to the number of Audio tracks.
Save your project then try....
1) Deleting all the tracks except 1-3 and see if that exports.
3) If it can manage that OK then move the clips up/or down to reduce the number of tracks. Clips can overlap without having to have their own track.
Edit: That is; you can overlap Track 2 on Track 1 continuously with an occasional Track3.....
.... .... .... Clip2 on Track 2 ............... Clip4 on Track 2..............Clip6 on Track2
Clip1 on Track 1 ....... Clip3 on Track 1 ......... Clip5 on Track 1 .........etc.
Nat