st: error msg: file... can not be opened

[Luhang Wang <luhang@gmail.com>]

Dear all,

I got the error msg of "file...  count not be opened" when running a
do file. I close all the stata program and restart it and run the same
do file, then everything is OK. Could anyone give me some idea about
what is happening there? Many thanks!

Best,
Luhang

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