NSIS FileRead dont work with Variables - nsis

Question

I have minor problem in my NSIS-Script,
im calling this Function:
Function ReadAllDesc
Var /global j
${foreach} $j 0 $secCount + 1
SectionGetText $h $4
${StrContains} $5 "++" $4
${ifnot} $5 == ""
StrCpy $5 $4 "" 2
${else}
StrCpy $5 $4
${endif}
!insertmacro DESC_READ $4 $lang $5
${next}
FunctionEnd
in descriptionInit Function
The Macro that i insert is the following:
!macro DESC_READ addonText lang addonVar
FileOpen $6 "$TEMP\addonInstallerPreFolder\5.1\${addonText}_${lang}.txt" r
${if} ${addonText} == proFile
FileRead $6 $proFileDesc
${else}
${if} ${addonText} == "ExtensionsFrame"
FileRead $6 $extensions
${else}
FileRead $6 $${addonVar}
${endIf}
${endIf}
FileClose $6
!macroend
at compile time i get an error in the macroline FileRead $6 $${addonVar} that the syntax is false. But when i change the macro call to a fix example like:
!insertmacro DESC_READ "ExtensionsFrame" $lang "extensions"
it works correctly. I need this because of i´m reading an Variable count on descriptions and don´t want to write fix code in this case.