MyChat Client error #0266: you can't invite the user UIN XX to the conference "NAME" (UID NNN) because you are not a member
Error
MyChat Client error #0266: you can't invite the user UIN XX to the conference "NAME" (UID NNN) because you are not a member
Error description
Be a member of a conference to be able to invite other users.
Problem solution
This error can occur when you invite someone while being kicked out from a conference or when you use an alternative client applciation that does not work fully correctly.
Make sure you are a member of a conference when inviting a user to it.