How to update from v10 to V11

[root13F]

Switch branches in V11 [ cannot import name Database issue]

i installed ERPNext V11 and when i run bench switch-to-master it told Switched to master Please run `bench update --patch` to be safe from any differences in database schema but when i run it it gives me this error Backing up sites... Traceback (most recent call last): File "/usr/lib/python2.7/runpy.py", line 174, in _run_module_as_main "__main__", fname, loader, pkg_name) File "/usr/lib/python2.7/runpy.py", line 72, in _run_code exec code in run_globals File "/opt/frappe/newe…