Change Splash Screen Error

I want to change the Firefox Splash Screen using NSIS compiler.

When I compile the FirefoxPortable.nsi file the following error message is displayed.

!include: "ReplaceInFileWithTextReplace.nsh"
Function: "ReplaceInFile"
Exch($0,0)
Exch(st(1),0)
Exch($1,0)
Exch(st(2),0)
Exch($2,0)
Exch(st(3),0)
Exch($3,0)
Push: $4
Push: $5
StrCpy $4 "$2.OldReplaceInFile" () ()
!insertmacro: textreplace::ReplaceInFile
Invalid command: textreplace::_ReplaceInFile
Error in macro textreplace::ReplaceInFile on macroline 1
!include: error in script: "ReplaceInFileWithTextReplace.nsh" on line 23
Error in script "C:\Documents and Settings\Administrator\Desktop\Firefox\Firefox\Other\Source\FirefoxPortable.nsi" on line 75 -- aborting creation process

How to fix it.