hi all
the problem is :
i written a file name app.fs
app.fs source:

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namespace myApp
module app =
    let foo = ..(now ,i think of  i need write some module first , so  i add a new file : config.fs)

config.fs source :

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namespace myApp
module config=
    let someConfig = "aaa"

and ,wo go back to app.fs ,continue coding

app.fs source:

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namespace myApp
module app =
    let foo = config.  (nothing going up, here i can not using the new module config)

now i am so confuse.

and i saved all files,and backup all files
then i delete two files from my project,
follow , i add two files to my project , different is : i add config.fs at first!
now i try accessing config module in app.fs
success

some guys encounter this problem yet?
now , i am so disappoint ....

sorry about previous source code format