Unable to create module

I have this code:

Strict

Module SG.GetParameterNameNValue

Import BRL.Basic
Import BRL.Blitz

Function GetParameterName$(LineFromFileRead$)
	' This function returns the first part of the given string
	' It takes all chars from the first char to the "=" and removes the spaces, tabs and the "=" from it

	Local PosInString%
	Local ParameterName$

	' Find position of the "="-character
	PosInString% = Instr(LineFromFileRead$, Chr(61))

	' If no match ("=") has been found, return entire "LineFromFile" (instead of nothing)
	If PosInString% = 0 Then
		PosInString% = Len(LineFromFileRead$)
	EndIf

    ' Get first chars from the string until the "="
    ParameterName$ = Left$(LineFromFileRead$, PosInString%)

	' Replace:
	' - tab-chars (= Chr(9))
	' - spaces (= Chr(32))
	' - equal sign (= Chr(61))
	' with nothing (= ""), so only the parameter-name remains
	ParameterName$ = Replace$(ParameterName$, Chr(9), "")
	ParameterName$ = Replace$(ParameterName$, Chr(32), "")
	ParameterName$ = Replace$(ParameterName$, Chr(61), "")

	' Return the parameter name
	Return ParameterName$
End Function

Function GetParameterValue$(LineFromFileRead$)
	' This function returns the second part of the given string
	' It takes all the chars from the position of the ("=" + 2) to the end of the string

	Local PosInString%
	Local ParameterValue$

	' Find position of the "="-character
	PosInString% = Instr(LineFromFileRead$, Chr(61))

    ' Get the last chars from the string (starting from the position of the ("=" + 2 chars))
    ParameterValue$ = Mid$(LineFromFileRead$, PosInstring% + 2)

	' Return the parameter value
	Return ParameterValue$
End Function

I saved this file here:
c:\BlitzMax\Mod\SG.mod\GetParameterNameNValue.mod\GetParameterNameNValue.bmx

When I choose "Build modules" in the IDE, I get an error, stating the "Instr"-identifier hasn't been found.
I tried importing BRL.Basic and BRL.Blitz (as you can see), but then I got the same error.

The docs say that the Instr-function is part of the Basic-module.

Can anyone help me with this?
Which module(s) do I have to Import to be able to build this module?

try Import BRL.Retro, will check the docs...

Now the module compiles without any errors (in debug and release mode), but when I shutdown BMax, restart it and try to use the functions, then I get the error "Identifier 'GetParameterName' not found".

When I try to import my mod (using "Import sg.GetParameterNameNValue"), then I get the error "Can't find interface for module SG.GetParameterNameNValue".

[Edit]
I saw in the mods directory that all modules used lowercase characters only, so I tried it too for my mod and now it works, while using the "bmk makemods" command in the dos-prompt.

Is it required that all module names and directories must be lowercase?
[/Edit]

I had a lot of trouble compiling, until I switched to all lowercase too.

I know you said you fixed it, but this utility by jb tells you what mods need to be included. http://www.blitzmax.com/Community/posts.php?topic=47141