Uncaught exception Error in my ML code - sml

When I use the Emacs to run my SML codes to understand the errors I get an error message. No matter what my codes are, every time I try SML/Process/start SML repl
and then type use "project name";, I get this message:
use "New_Pro";
[Opening New_Pro]
[use failed: Io: OpenIn failed on "New_Pro", Win32TextPrimIO:openRd: failed]
uncaught exception Error
raised at: .../compiler/TopLevel/interact/interact.sml:24.14-24.28
-
What's wrong with it?

I can use C-c C-l to load my Project.

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