ERROR L218E : how to solve it?

I am new to KEIL and start learning for an project. I have got the message error shown below : Error: L6218E: Undefined symbol ADC_RegularChannelConfig (referred from main_test_adc.o).

I searched about this error but I still don't know how to solve it. I am using uvision 4 and stm32f103rb processor and write a simple program using ADC.
Please help me if you encounter similar problem before. I really appreciate everyone's help. :)

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  • It shouldn't matter if you are new to Keil.

    Your program wants to call a specific function, but your project doesn't contain any source file with the source code for that function. And the project doesn't contain an object file or library with a pre-compiled version of that function.

    So either you need to figure out why your program wants to use that function. Or you'll have to go searching for that function.

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  • It shouldn't matter if you are new to Keil.

    Your program wants to call a specific function, but your project doesn't contain any source file with the source code for that function. And the project doesn't contain an object file or library with a pre-compiled version of that function.

    So either you need to figure out why your program wants to use that function. Or you'll have to go searching for that function.

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