Some users may receive the following error message when attempting to run an estimation command in Stata:

     "c(showbaselevels) undefined"
The Stata package has two components: the executable and the ado-files. One of the components is out of sync with the other because of an incomplete update. The error can be resolved by completing an update. The update commands will restart Stata, so make sure that any important information is saved before you proceed. If you have a direct Internet connection, type

     . update executable, force
     . update swap   
It is not necessary to type update swap on a Windows machine, because update executable, force does this automatically.

After the update swap is complete, type

     . update ado, force
After the update is successfully completed, your estimation command should work properly.

http://www.stata.com/support/faqs/web/showbase.html

update swap 后 总是显示“另一个程序正在使用此文件，进程无法访问。


Could not copy E:\课件\计量\[Stata].stata11\[Stata].stata11\StataSE.exe to E:\课件\计量\[Stata].stata11\[Stata]
> .stata11\StataSE_old.exe
”  请问这是为什么啊？我没有打开其他程序咯。。

同问啊