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

warning: solve(): system is singular (rcond: 3.22591e-19); attempting approx solution

warning: solve(): system is singular (rcond: 3.22591e-19); attempting approx solution

warning: solve(): system is singular (rcond: 3.22591e-19); attempting approx solution

warning: solve(): system is singular (rcond: 3.22591e-19); attempting approx solution

warning: solve(): system is singular (rcond: 3.22591e-19); attempting approx solution

warning: solve(): system is singular (rcond: 7.74539e-19); attempting approx solution

warning: solve(): system is singular (rcond: 7.74539e-19); attempting approx solution

warning: solve(): system is singular (rcond: 7.74539e-19); attempting approx solution

warning: solve(): system is singular (rcond: 7.74539e-19); attempting approx solution

warning: solve(): system is singular (rcond: 7.74539e-19); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-18); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-18); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-18); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-18); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-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: 8.10808e-18); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-18); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-18); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-18); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-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: 8.10808e-18); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-18); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-18); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-18); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-18); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-18); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-18); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-18); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-18); attempting approx solution

warning: solve(): system is singular (rcond: 8.10808e-18); attempting approx solution
Error: processing vignette 'tramnet.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'tramnet.tex' failed.
LaTeX errors:
! LaTeX Error: File `accents.sty' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: sty)

! Emergency stop.
<read *> 
         
l.46 ^^M
        
!  ==> 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