PDF version of manual without hyperrefs or index

LaTeX errors when creating PDF version.
This typically indicates Rd problems.
LaTeX errors found:
! Undefined control sequence.
<argument> \dfrac 
                  {\exp ( x_{[i,c]} + a_{[c]} )}{\sum _{j=1}^k\exp ( x_{[i,j...
l.583 ...sum_{j=1}^k\exp( x_{[i,j]} + a_{[j]})}}{}
LaTeX errors when creating PDF version.
This typically indicates Rd problems.
LaTeX errors found:
! Undefined control sequence.
<argument> \dfrac 
                  {\exp ( x_{[i,c]} + a_{[c]} )}{\sum _{j=1}^k\exp ( x_{[i,j...
l.583 ...sum_{j=1}^k\exp( x_{[i,j]} + a_{[j]})}}{}
LaTeX errors when creating PDF version.
This typically indicates Rd problems.
LaTeX errors found:
! Undefined control sequence.
<argument> \dfrac 
                  {\exp ( x_{[i,c]} + a_{[c]} )}{\sum _{j=1}^k\exp ( x_{[i,j...
l.581 ...sum_{j=1}^k\exp( x_{[i,j]} + a_{[j]})}}{}
LaTeX errors when creating PDF version.
This typically indicates Rd problems.
LaTeX errors found:
! Undefined control sequence.
<argument> \dfrac 
                  {\exp ( x_{[i,c]} + a_{[c]} )}{\sum _{j=1}^k\exp ( x_{[i,j...
l.581 ...sum_{j=1}^k\exp( x_{[i,j]} + a_{[j]})}}{}
LaTeX errors when creating PDF version.
This typically indicates Rd problems.
LaTeX errors found:
! Undefined control sequence.
<argument> \dfrac 
                  {\exp ( x_{[i,c]} + a_{[c]} )}{\sum _{j=1}^k\exp ( x_{[i,j...
l.581 ...sum_{j=1}^k\exp( x_{[i,j]} + a_{[j]})}}{}