What version of Premiere Elements are you using and on what computer operating system it is running?
Can we assume that you are trying to load 200 jpg photos into an Elements Organizer that comes with some version of Premiere Elements? How many entries do you already have if this is an Elements Organizer matter?
What are the pixel dimensions of these jpegs? And, please give a description of your computer resources. Are these photos that might have been edited in Photoshop where a color profile of CMYK might have been given them?
Is this a "it worked before but not now" or "it never worked before" type problem?
It would be a good idea to troubleshoot these 200 by doing the loading in small batches so that you might be able to point the issue to a corrupt file or files in the bunch.
Please review, consider, and supply more information. Then we will decide what next.