The list of pages provided with the RESTORE PAGE statement is incorrectly formatted. Prior to the problem %1!s! pages were ...

The list of pages provided with the RESTORE PAGE statement is incorrectly formatted. Prior to the problem %1!s! pages were correctly identified. The problem was hit at character offset %2!s!. Check that all pages are identified by numeric : pairs with commas separating each pair.  For example: PAGE='1:57,2:31'.