please provide information for ivivc for R

Error: invalid assignment for reference class field ‘font_attr’, should be from class “list” or a subclass (was class “character”)

You haven't provided sufficient information that would allow someone to help you...
But I can tell you that it seems the package in question has been removed from CRAN many years ago, and so I would be suspicious of relying on it. Perhaps a current cranworthy package such as Rivivc might cover the functionality you want.

Loading required package: gWidgetsRGtk2
Error in (function (classes, fdef, mtable) :
unable to find an inherited method for function ‘.gwindow’ for signature ‘"guiWidgetsToolkitRGtk2"’

please sir solve the error

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