Display:

$\text{Unrecognized element: mfraction; arguments were:}1+\sqrt{5}\text{and}2$

Source:

<merror>
     <mtext> Unrecognized element: mfraction; arguments were: </mtext>
     <mrow>
          <mn> 1 </mn>
          <mo> + </mo>
          <msqrt>
               <mn> 5 </mn>
          </msqrt>
     </mrow>
     <mtext> and </mtext>
     <mn> 2 </mn>
</merror>