Comment 8 for bug 492912

nick_s wrote:
> I'm experiencing similar problems in Inkscape on Xubuntu11.04.
> I create a circle, copy and paste it and a similar error pops up.

@nick_s, your problem is Bug #418242 “Incorrect call to output plugins (with persistent error message) on copy”. While working with Inkscape, disable whatever application you have running in the background which monitors or in some way manages the clipboard to avoid the error messages.