Can't create transaction: internal error: Failed to get height

I’m using

monero-gui-v0.15.0.2
Ledger Monero App 1.4.2

When I’m trying to do a send operation it fails with:

E result. THROW EXCEPTION: error::wallet_internal_error
E Can't create transaction:  internal error: Failed to get height

I have the same error with the monerujo app on Android:

monerujo 1.12.11

I have the same error when sending to own wallet.
This means for the moment I’m not able to make a transaction from my wallet.

An idea what could be done to solve this?