The actual error message is very clear:

NotImplementedError: Computation of dimensions of weight 1 cusp forms
spaces not implemented in general

This -clearly - means that no formula or algorithm has been
implemented in Sage for dimensions of weight 1 modular form spaces.
How much clearer could it be?!

John

On 19 June 2014 02:45, David Joyner <[email protected]> wrote:
> Does anyone know the answer to this?
>
>
> ---------- Forwarded message ----------
> From: M. <...>
> Date: Wed, Jun 18, 2014 at 8:43 PM
> Subject: Sage ModularForms() error?
> To: [email protected]
>
>
> David Joyner,
>
> When using the sagecell.sagemath.org server,
> when I evaluate the command:
>
>   ModularForms(Gamma1(29),1).basis()
>
> the error message is not very informative.
> The problem comes from the fact that
> "ModularForms(Gamma1(29),1)" has an
> "(unknown)" dimension currently. However,
> Magma returns [] for the basis using the
> Magma Calculator online. Is it possible to
> improve this situation? Shalom, M.
>
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