Hi,

I am not able to save a state using the WriteToFile function.

The code returns the following error:

**Index::write: Index is default initialized**

It's not clear to me why it's happening.

I have a bosonic system of size N with a certain cut-off to the Fock space.

The state is the following:

$$

|\psi\rangle = |0 0 ...\rangle \otimes |\psi*0\rangle \otimes |00..0\rangle
$$
where @@|\psi*0\rangle@@ is a certain state. Since I am able to compute local quantites and perform a TEBD real time evolution I don't see any issue with the state itself (e.g. mismatch with indices).

Could you help me?

Thank you in advance.

Riccardo