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Editorial Team
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Asked: 2026-06-01T11:03:37+00:00

I get the following error when trying to run my application. There are no

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I get the following error when trying to run my application. There are no errors in the source code.

                      Undefined symbols:
  "__Block_object_dispose", referenced from:
      ___destroy_helper_block_2 in myprojectAppDelegate.o
      ___destroy_helper_block_1 in myprojectAppDelegate.o

  "__NSConcreteStackBlock", referenced from:
      __NSConcreteStackBlock$non_lazy_ptr in myprojectAppDelegate.o
     (maybe you meant: __NSConcreteStackBlock$non_lazy_ptr)

  "__Block_object_assign", referenced from:
      ___copy_helper_block_2 in myprojectAppDelegate.o
      ___copy_helper_block_1 in myprojectAppDelegate.o

ld: symbol(s) not found
collect2: ld returned 1 exit status
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1 Answer

  1. Editorial Team

    The problem was with the Xcode version. The project was built in Xcode version4.2 and I was trying to run it on Xcode3.2. Later I updated the Xcode and changed the sdk to the latest one it started working..

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