Error: L6218E: Undefined symbol ADC_GetConversionValue

I'm trying to compile a source code from www.st.com/.../dm00050879.pdf in Keil. I get the following errors Error: L6218E: Undefined symbol ADC_GetConversionValue (referred from main.o). Error: L6218E: Undefined symbol ADC_GetFlagStatus (referred from main.o). Error: L6218E: Undefined symbol ADC_SoftwareStartConv (referred from main.o). I'm a beginner here, how to resolve them ?

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