Error when changing the status of an order

Hello.
When I try to change the status of an order, the error that I send in the attachment appears.

When I try to finalize an order it also gives an error.

Hi,

Please turn on the "debug" setting of the Joomla configuration and try again. It will display more information about the error, which will allow us to tell you what to do.

I have finally located the error.
It was a symbol (%) in a joomla language translation in a variable.
Thanks