Hello, can't make link, get this error message:

dcpp.lib(HashManager.obj) : error LNK2001: unresolved external symbol unwind.?fastHash@Hasher@HashManager@dcpp@@QEAA_NAEBV?$basic_string@DV?$char_traits@D@stlpx_std@@V?$allocator@D@2@@stlpx_std@@PEAEAEAV?$MerkleTree@VTigerHash@dcpp@@$0EAA@@3@_JPEAVCRC32Filter@3@@Z.0.11

But symbol unwind.?fastHash@Hasher@HashManager@dcpp@@QEAA_NAEBV?$basic_string@DV?$char_traits@D@stlpx_std@@V?$allocator@D@2@@stlpx_std@@PEAEAEAV?$MerkleTree@VTigerHash@dcpp@@$0EAA@@3@_JPEAVCRC32Filter@3@@Z.0.11 is contained inside dcpp.lib, I don't understand what the error message mean, any explanation?