Stack installing failed

[buaalyx]

I'm writing my paper, I want to convert my equations in .doc to latex formulas.
But the "mathml to tex" service here https://johnmacfarlane.net/texmath is unavailable.
So I tried to install texmath with stack, I installed stack successfully but when I run
stack install --flag texmath:executable
or
stack install --flag texmath:server
I got the following error message

Error parsing targets: The specified targets matched no packages.
Perhaps you need to run 'stack init'?

I'm new in haskell, the version of stack is the newest, so I really don't know how to fix it

[jgm]

Try

stack install --flag texmath:executable texmath

If you don't provide the package name as an argument, it will only work if you run stack in the root of this source repository.

[jgm]

Thanks for alerting me to the server issue. The server seems to die periodically for reasons that aren't clear to me.

[jgm]

I think the server issue is fixed.
Closing.