CONSOLE MESSAGE: line 8: Namespace prefix foo on bar is not defined

layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x289
  RenderBlock {html} at (0,0) size 800x289
    RenderBlock {parsererror} at (16,16) size 768x189 [bgcolor=#FFDDDD] [border: (2px solid #CC7777)]
      RenderBlock {h3} at (18,20) size 732x23
        RenderText {#text} at (0,0) size 323x22
          text run at (0,0) width 323: "This page contains the following errors:"
      RenderBlock {div} at (18,61) size 732x15
        RenderText {#text} at (0,0) size 526x14
          text run at (0,0) width 526: "error on line 1 at column 110: Namespace prefix foo on bar is not defined"
          text run at (525,0) width 1: " "
      RenderBlock {h3} at (18,94) size 732x23
        RenderText {#text} at (0,0) size 424x22
          text run at (0,0) width 424: "Below is a rendering of the page up to the first error."
      RenderBlock {p} at (18,134) size 732x37
        RenderText {#text} at (0,0) size 721x36
          text run at (0,0) width 721: "This document was created as the result of an XSL transformation. The line and column numbers given are from"
          text run at (0,18) width 145: "the transformed result."
    RenderBody {body} at (8,220) size 784x53
      RenderBlock {p} at (0,0) size 784x18
        RenderText {#text} at (0,0) size 230x18
          text run at (0,0) width 230: "You should see error text above this"
      RenderBlock (anonymous) at (0,34) size 784x0
        RenderInline {foo:bar} at (0,0) size 0x0
      RenderBlock {p} at (0,34) size 784x18
        RenderText {#text} at (0,0) size 354x18
          text run at (0,0) width 354: "ERROR? this, and nothing below it should be rendered"