I'm also stuck with FSR error when using DT's elapsed timer on 16F1936

[richard]

why timer3 ?
any timer that can provide a 10mS interrupt could be employed, the self configuring aspect of the code will not function for modern pic chips. the code will need a tickle to adapt it to valid timer settings for your chosen chip
what have you tried ?

[CuriousOne]

I don'know - author on the link above used timer3.
I guess, mechanically changing it to timer1 or 2 won't work, since there's some ASM code involved...

[richard]

I guess, mechanically changing it to timer1 or 2 won't work, since there's some ASM code involved...

if you don't try you will never know