本人在运行cdsimeq的程序时，结果中出现了
variable(s) have been dropped during the OLS estimation.
This is probably due to  collinearity.
check IDENTIFICATION(I.E., EXCLUSION CRITERIA)
Estimation cannot continue.
然后程序就运行不下去了，请问是什么原因，应该如何解决，求帮助！万分感谢！