Dear Otared,

I run the given  code and got an error message as following.

tex error       > tex error on line 1 in file virtual://block.answer.2: ! Undefined control sequence

l.1 \myanswer

<empty file>

Would you please tell me how to avoid such an error?
It seems to me that you don’t have an error.

I am running minimal(beta) in OSX.

Thank you.

Best regards,