5 of 6 added 91 characters in body

JavaScript, 103 101 99 97 93

This implementation is based on primo's comprehensive description of the algorithm he used.

for(e=l=x=prompt(g=1e5);--g;l=(x>1?y=1-1/x:-(y=x-1))*l+y/g)
    e=1+e/g*x;
alert([e,x>0?l:"ERROR"])

Edit:
- Trying to catch Perl. Stole a byte back from primo by copying his branch. :)
- 2 more bytes courtesy of primo.
- Finally, caught primo's version! With primo's help, of course... :)