我已经用C语言编写了代码，当我在Fluent上加载时，会出现以下类型的错误
Creating library libudf.lib and object libudf.exp
Source.obj : error LNK2019: unresolved external symbol UDSI referenced in function spe_anion_ne
Source.obj : error LNK2001: unresolved external symbol UDSI
Source.obj : error LNK2001: unresolved external symbol UDSI
Source.obj : error LNK2001: unresolved external symbol UDSI
Source.obj : error LNK2001: unresolved external symbol UDSI
libudf.dll : fatal error LNK1120: 1 unresolved externals