[ESS] Wrong type argument: numberp, t

[Stephen Eglen]

>
> When I try pasting several lines of code on an R session I get:
>
> "Wrong type argument: numberp, t"
>
> and it only evaluates the first line.

Whenever you get an error in Emacs, try generating a backtrace.  From
the *info*:
----------------------------------------------------------------------
If Emacs reports an error, backtraces can help us debug the problem.
Type "M-x set-variable RET debug-on-error RET t RET".  Then run the
command that causes the error and you should see a *Backtrace* buffer
containing debug information; send us that buffer.