What’s the full message you are getting? In any case, in the \LaTeX-name for {\eta_{L}} you are missing a closing bracket.
Thank you very much for the reply: the message was the warning in my message and the the reason was the error that you found
What’s the full message you are getting? In any case, in the \LaTeX-name for {\eta_{L}} you are missing a closing bracket.
Thank you very much for the reply: the message was the warning in my message and the the reason was the error that you found