problem with malmq (author written ado to calculate malmquist)

I use malmq to calculate malmquist in stata14, but it could not save the result to a file. The program is as follows:

use "E:\chi11_lee_files\lee2.dta"
malmq i_AC = O_SPI O_CPI,period( time) sav(E:\test\abc.dta)

then there comes a error message: <istmt>: 3499 file_exists() not found
I don't know what's wrong with it?