MathOverflow will be down for maintenance for approximately 3 hours, starting Monday evening (06/24/2013) at approximately 9:00 PM Eastern time (UTC-4).

The error was the following. He proved that certain function, say analytic on $(0,1]$ has an asymptotic expansion of the form $$f(x)\sim \sum_{n=0}^\infty a_n x^n,$$ in the usual sense that asymptotic expansions are understood.
He concluded that $f$ has finitely many zeros on $(0,1]$.