Limits with HP50G

[Gil]

I write

'lim((1+1/X)^X,X=infinity)'

with the sign of infinity in the calculator (SL+0)

or
'lim(SIN(X)/X,X=\oo)'

I press then EVAL
and get the message
EVAL Error
Non algebraic in expression

What's wrong?

If am not mistaken, I used to get the right answer with my calculator.

Thanks for your help.

Gil