请教大神CCS软件的程序问题

哪位大神知道用CCS上“error #10234-D: unresolved symbols remain

error #10010: errors encountered during linking; "timer.out" not built
>> Compilation failure
gmake: *** [timer.out] Error 1”这样的错误是怎么回事啊？为啥总改不对呢？跪求指点