Help Removing Errors.

Hi,

Can you help me figure out how I can locate these files in the file heirarchy so that I can delete them and no longer receive an error code? Thank you.

ERROR: Download of "http://lubutocollections.org/403",
referenced from "http://lubutocollections.org/index/index/page/1?output=atom",
failed with error code -1102 (The operation couldn’t be completed.)
ERROR: Download of "http://lubutocollections.org/archive/files/99_Luvale_3_Mujimbu_13.001.pr",
referenced from "http://lubutocollections.org/archive/files/8276120e51585a6f36900e435b28ae93",
failed with error code -1100 (File does not exist.)
ERROR: Download of "http://lubutocollections.org/archive/files/hafuma_page_01_08e2cbc9ab.jpg",
referenced from "http://lubutocollections.org/items/browse/page/5?output=rss2",
failed with error code -1100 (File does not exist.)
ERROR: Download of "http://lubutocollections.org/collections/show/public_html/application/views/scripts/images/Zambiamap.gif",
referenced from "http://lubutocollections.org/collections/show/15",
failed with error code -1100 (File does not exist.)

The item files are located in the /archive directory:

youromekafolder/archive/files/