A matching symbol was not found in this folder

I have standalone sdk for a fingerprint device. When I tried to debug, I got this message, "The breakpoint will not currently be hit, No symbols have been loaded for this document". I tried Build>Windows>Modules to load symbol. but they referred a symbol of one of the dll file (Interop.zkemkeeper.pdb). which I didn't find there instead I found a .pdb file as my project name (AttLogs.pdb). (I know its not logical though) I tried to choose the AttLogs.pdb. and then I got a message saying, "A matching symbol was not found in this folder". So,
1. How do I make my code debug-able? or
2. How do I create a Interop.zkemkeeper.pdb file?
please suggest me anything related or helpfull. I got stuck here for about a week.