gistfile1.txt

! Undefined control sequence.
\reserved@a ->\@nil 
                    
\new@ifnextchar ...eserved@d = #1\def \reserved@a 
                                                  {#2}\def \reserved@b {#3}\...
<argument> ...ef \col@stack {\col@stack \SEP@char 
                                                  \TAB@strutLeftC \TABcell {...

\@firstoftwo #1#2->#1
                     
<argument> ...heTABcellindex@ }\TAB@strutRightC }}
                                                  \iftoggle {fixed@TABwidth}...

\@firstoftwo #1#2->#1
                     
...
l.76 }
      
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.