Errror trying to create a package in RTC 6.0.2

Upgrading from RTC 5.0.2 to RTC 6.0.2 and I'm getting the following error:

CRJZZ0920E: REXX version 4.0.1 is lower than runtime version 5.0.2

      [exec]   Zip name : package.zip
      [exec]   Build Definition Version : 4.0
      [exec]   Runtime Version : 5.0.2
      [exec]   CRJZZ0920E: REXX version 4.0.1 is lower than runtime version 5.0.2
      [exec]   ISPD117                            
      [exec]   The initially invoked CLIST ended with a return code = 8
      [exec]   </ISPF>
      [exec]   RC=8                                                                                                                    
      [exec]   </ISPINFO>
      [exec]   ISPRC = 8     

Currently the same rexx (BLZPKGZP) is running on RTC 5.0.2 our production system.

Thanks in advance