PL/SQL wrap utility fails but the package compiles fine it not wrapped

Hi,

I'm using the PL/SQL wrap utility for the first time and I'm having trouble already!

When I try to wrap a package, I get the following error:

PSU(103,1,159,18):Encountered the symbol "CASE" when expecting one of the following:

   ( - + mod null <an identifier>
   <a double-quoted delimited-identifier> <a bind variable> avg
   count current max min prior sql stddev sum variance cast the
   <a string literal with character set specification>
   <a number> <a single-quoted SQL string>

When I compile the same package, it works fine. I found the following note:

Wrap Utility Will Fail trying to wrap PL/SQL code Containing New Introduced SQL Expressions [ID 343015.1]