hi all, I am using XC164CS board.when i build my source code linker error occurs.How to overcome the following linker error.What is the reason for such error?.The help is not very clear to me.waiting for your reply. Build target 'Target 1' linking... *** ERROR L127: UNRESOLVED EXTERNAL SYMBOL SYMBOL: Convol MODULE: real_T_FFT.obj (REAL_T_FFT) *** ERROR L128: REFERENCE MADE TO UNRESOLVED EXTERNAL SYMBOL: Convol MODULE: real_T_FFT.obj (REAL_T_FFT) ADDRESS: 1BAAH Target not created Thanks in advance Chris