Error: resolving install function "Nsis2Io" in function "mui.WelcomePre_26.5.9"
This error was reported by someone about two months ago. No cause was found, the user solved it by disabling Modern UI. Today I encountered the same error (though with a different mui.WelcomePre_xxxxx). A copy of my forum post:
It occured when I remmed the line !insertmacro MUI_LANGUAGE "CustomLanguagefile1" . Enabling the line back again solved it. Disabling the Finish page also solved it.
It's got to have something to do with cross-version format changes of the language files, but I don't understand why it would give errors if I remove the entire line. After all, it should just use the default language then, right? And that should always work with the currently installed version of NSIS, right? (Unless the installer failed to overwrite it, but I have no reason to assume that.)
Edit: Note that my CustomLanguagefile1 was a copy from the *new* English languagefile, with one line edited. So it should be 100% new-version-compatible.
The thread can be read here: http://forums.winamp.com/showthread.php?s=&postid=2276783#post2276783
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