Error in "optimistix/docs/examples /optimise_diffeq.ipynb"

Hi, I was trying to run the example given in "optimistix/docs/examples /optimise_diffeq.ipynb". For some reason I am receiving error "---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
__________________________________________________________________ Cell 4 line 9
5 pred_values = batch_solve(parameters, y0s, saveat)
6 return values - pred_values
----> 9 (y0s_0, values_0) = get_data()
10 y0s = jnp.array(y0s_0)
11 values = jnp.array(values_0)

__________________________________________________________________ Cell 4 line 1
9 saveat = dfx.SaveAt(ts=jnp.linspace(0, 30, 20))
10 batch_solve = eqx.filter_jit(eqx.filter_vmap(solve, in_axes=(None, 0, None)))
---> 11 values = batch_solve(true_parameters, y0s, saveat)
12 return y0s, values

[... skipping hidden 21 frame]

__________________________________________________________________ Cell 4 line 2
19 t1 = saveat.subs.ts[-1]
20 dt0 = 0.1
---> 21 sol = dfx.diffeqsolve(
22 term,
23 solver,
24 t0,
25 t1,
...
--> 305 raise ValueError("No arrays to thread error on to.")
306 dynamic_x = _error(dynamic_x, pred, index, msgs=msgs, on_error=on_error)
307 return combine(dynamic_x, static_x)

ValueError: No arrays to thread error on to.". I would appreciate if I could get help to fix it.

Open optimistix/docs/examples /optimise_diffeq.ipynb and run Cell 4 to reproduce the traceback from get_data through batch_solve and diffeqsolve. Trace the "No arrays to thread error on to" failure and confirm the notebook example runs successfully without that ValueError.