How to solve this? What command line to switch Frappe version?

This issue is so similar to other, but I don’t find by 15 and 16 versions
How to solve this? What command line to switch Frappe version?

This issue is so similar to other, but I don’t find by 15 and 16 versions
Try running the command bench switch-to-develop. This will switch Frappe and ERPNext to the develop branch. If you specifically want version 15 of Frappe, you should switch to the version-15 branch instead
I try with this command
bench switch-to-branch version-15
Thanks