when edit extension_src and rezip it and i got "Error Jive package missing meta.json and definition.json"

i have a custom add-on which contains multiple apps. But i want to remove one app, so i edit the extension_src file like below:

extension_src -> definition.json

before edit:

{

   "integrationUser": {

   "systemAdmin": true,
   "jiveServiceSignature": "cGueDqVBBlRYONUJpBIBa08RtYo="
   },
   "osapps": [

  {

   "name": "GroupReport",
   "id": "cc3e09ec-95af-557a-88f6-99f2ff1097fd",
   "appPath": "cc3e09ec95af557a88f699f2ff1097fd",
   "url": "%serviceURL%/osapp/activity_report/app.xml"
   },

   {

   "name": "bulk_add_users_app",
   "id": "7e9c54a4-2b44-57a6-a177-8aebaab9a615",
   "appPath": "7e9c54a42b4457a6a1778aebaab9a615",
   "url": "%serviceURL%/osapp/bulk_add_users/app.xml"
   }

  ]

}

after edit:

{

   "integrationUser": {

   "systemAdmin": true,
   "jiveServiceSignature": "cGueDqVBBlRYONUJpBIBa08RtYo="
   },
   "osapps": [

   {

   "name": "bulk_add_users_app",
   "id": "7e9c54a4-2b44-57a6-a177-8aebaab9a615",
   "appPath": "7e9c54a42b4457a6a1778aebaab9a615",
   "url": "%serviceURL%/osapp/bulk_add_users/app.xml"
   }

  ]

}

All i did is just remove the GroupReport from osapps.  And then, rezip the extension_src file. when i try to install the package, i got error:

"Jive package missing meta.json and definition.json".

Did i do anything wrong?

Thanks,