[Linker Error] Unresolved external 'TDataModule1:' referenced from D:\WORKS\2006.02.6\12121.OBJ,该怎么解决

[Linker Error] Unresolved external 'TDataModule1::' referenced from D:\WORKS\2006.02.6\12121.OBJ
怎么解决，动态编译就没有问题，换成静态就这样了

[Linker   Error]   Unresolved   external   '_DataModule1 '   referenced   from   D:\WORKS\2006.02.6\SYSLOGSOFT.OBJ

[Linker   Error]   Unresolved   external   'TDataModule1:: '   referenced   from   D:\WORKS\2006.02.6\SYSLOGSOFT.OBJ

------解决方案--------------------
DataModule这个单元是否添加到工程中了？