bufio.Scanner: token too long

[YuanDaoDao001]

Hello,

When I run sudo singularity build clockwork.img clockwork_container.def , throw error 2021/11/13 15:54:03 bufio.Scanner: token too long FATAL: Unable to build from clockwork_container.def: while parsing definition: clockwork_container.def: bufio.Scanner: token too long.

But use the example of Singularity official document, is run successfully.

Can you tell me how should do?

thanks.