How to solve the error while adding new classes [duplicate]

This question already has answers here: Closed 11 years ago.

Possible Duplicate:

Duplicate Symbol Error in Objective-C build?

What I did is creating two different iPhone applications individually, now what I need is I have to combine these two applications as single application by using tabbar controller.But while adding the second application classes to first classes it shows the error:

Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1

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I can't understand what is it and one more is shown as:

• Duplicate Symbol _count in

  /users/ensisinfosolutionscom/Desktop/abc/build/CustomImagePicker.build /Debug-iphonesimulator/CustomImagePicker.build/Objects-normal/i386/numbers.o and /users/ensisinfosolutionscom/Desktop/abc/build/CustomImagePicker.build/Debug-iphonesimulator/CustomImagePicker.o

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here c开发者_运维技巧ustomimagepicker is my class name. What is this error?

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This looks like you are lacking some library