p-adic elliptic curves

[Mak Trifkovic <mak@math.mcgill.ca>]

I'm trying to initialize 17A1`over Q_17, by typing, for various values of 
i,

ellinit([1, -1, 1, -1, -14]*(1+O(17^i)].

For i<=4, I get the error message 'singular curve in initell'.

For 5<=i<=12, I get the error message 'insufficient precision in initell'.

What is going on here?  Is there a formula to determine the minimum 
precision required?

Mak