Error(s) in re-building vignettes:
--- re-building ‘tramnet.Rnw’ using knitr

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular (rcond: 2.2287e-18); attempting approx solution

warning: solve(): system is singular (rcond: 2.2287e-18); attempting approx solution

warning: solve(): system is singular (rcond: 2.2287e-18); attempting approx solution

warning: solve(): system is singular (rcond: 2.2287e-18); attempting approx solution

warning: solve(): system is singular (rcond: 2.2287e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution

warning: solve(): system is singular (rcond: 3.92574e-18); attempting approx solution
Error: processing vignette 'tramnet.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'tramnet.tex' failed.
LaTeX errors:
! Undefined control sequence.
<argument> MT@patch@undo@@\MT@patch@name 
                                         
l.466 \begin{document}
                      
! Emergency stop.
<argument> MT@patch@undo@@\MT@patch@name 
                                         
l.466 \begin{document}
                      
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘tramnet.Rnw’

SUMMARY: processing the following file failed:
  ‘tramnet.Rnw’

Error: Vignette re-building failed.
Execution halted