When I try to plot a long sheet of paper my MicroStation crashes. I used to plot this all the time and then we updated my machine and now I cant figure this out. Other people in the office can print it (pdf) so it is possible. This happens with all of my big plots now.
You should post this in the printing forum. You also need to tell us what version of Microstation. Looks like you are running out of memory so you will also need to tell us how much memory you have and if you are rasterizing the plot. There is not enough info here for anyone to help you.