[MiKTeX] \No command

[Alexander G. (mail.r. <a.g...@ma...>]

Dear  Ulrike,

Upon installing MikTeX on a new machine, I encountered a problem that has never arisen previously. Despite 'babel' with the 'russian' option are mentioned in the preamble, the \No command (specifying the Russian version of the number sign) is claimed to be indefined. How could I fix this error?

Thank you in advance for your consultation.

Best regards,
Alexander