This is due to an issue with the Shelving locations list in Service Configuration under WorldCat Discovery and WorldCat Local > Holding Codes and Shelving location messages > Holding Codes Translation Table. Copy out the text in the list to a Notepad file, erase any extraneous characters (like semicolons) from the top of the list, then re-paste the list into the field.
There is more on the Holding Codes Translation table.