can't insert function .onGUIInit

Function: ".onGUIInit"
Error: Function named ".onGUIInit" already exists.
i check function .onGUIInit readly...not exist

are you sure? are you using the Modern UI, perhaps? If so, check the Modern UI documentation for "Customize Modern UI Functions"

These defines should be set before inserting the language macros.

MUI_CUSTOMFUNCTION_GUIINIT function
MUI_CUSTOMFUNCTION_UNGUIINIT function
MUI_CUSTOMFUNCTION_ABORT function
MUI_CUSTOMFUNCTION_UNABORT function

you need to use these defines, as MUI already uses those functions itself.