Upgrading to V11 not a Not a git repository error

bench switch-to-branch version-11
fatal: Not a git repository (or any parent up to mount point /home)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
Traceback (most recent call last):
File “/usr/local/bin/bench”, line 11, in
load_entry_point(‘bench’, ‘console_scripts’, ‘bench’)()
File “/home/frappe/.bench/bench/cli.py”, line 40, in cli
bench_command()
File “/usr/local/lib/python2.7/dist-packages/click/core.py”, line 722, in call
return self.main(*args, **kwargs)
File “/usr/local/lib/python2.7/dist-packages/click/core.py”, line 697, in main
rv = self.invoke(ctx)
File “/usr/local/lib/python2.7/dist-packages/click/core.py”, line 1066, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/usr/local/lib/python2.7/dist-packages/click/core.py”, line 895, in invoke
return ctx.invoke(self.callback, **ctx.params)
File “/usr/local/lib/python2.7/dist-packages/click/core.py”, line 535, in invoke
return callback(*args, **kwargs)
File “/home/frappe/.bench/bench/commands/update.py”, line 138, in switch_to_branch
switch_to_branch(branch=branch, apps=list(apps), upgrade=upgrade)
File “/home/frappe/.bench/bench/app.py”, line 396, in switch_to_branch
switch_branch(branch, apps=apps, bench_path=bench_path, upgrade=upgrade)
File “/home/frappe/.bench/bench/app.py”, line 360, in switch_branch
version_upgrade = is_version_upgrade(app=app, bench_path=bench_path, branch=branch)
File “/home/frappe/.bench/bench/app.py”, line 259, in is_version_upgrade
upstream_version = get_upstream_version(app=app, branch=branch, bench_path=bench_path)
File “/home/frappe/.bench/bench/app.py”, line 326, in get_upstream_version
contents = subprocess.check_output([‘git’, ‘show’, ‘upstream/{branch}:{app}/init.py’.format(bran ch=branch, app=app)], cwd=repo_dir, stderr=subprocess.STDOUT)
File “/usr/lib/python2.7/subprocess.py”, line 574, in check_output
raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command ‘[‘git’, ‘show’, ‘upstream/version-11:advocate/init.py’]’ ret urned non-zero exit status 128

I have a custom app, what do i need to do in order to upgrade?

was able to fix this error updating pip

however i have a new error:
File “/usr/local/bin/bench”, line 11, in
load_entry_point(‘bench’, ‘console_scripts’, ‘bench’)()
File “/home/frappe/.bench/bench/cli.py”, line 40, in cli
bench_command()
File “/usr/local/lib/python2.7/dist-packages/click/core.py”, line 722, in call
return self.main(*args, **kwargs)
File “/usr/local/lib/python2.7/dist-packages/click/core.py”, line 697, in main
rv = self.invoke(ctx)
File “/usr/local/lib/python2.7/dist-packages/click/core.py”, line 1066, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/usr/local/lib/python2.7/dist-packages/click/core.py”, line 895, in invoke
return ctx.invoke(self.callback, **ctx.params)
File “/usr/local/lib/python2.7/dist-packages/click/core.py”, line 535, in invoke
return callback(*args, **kwargs)
File “/home/frappe/.bench/bench/commands/update.py”, line 138, in switch_to_branch
switch_to_branch(branch=branch, apps=list(apps), upgrade=upgrade)
File “/home/frappe/.bench/bench/app.py”, line 396, in switch_to_branch
switch_branch(branch, apps=apps, bench_path=bench_path, upgrade=upgrade)
File “/home/frappe/.bench/bench/app.py”, line 362, in switch_branch
raise MajorVersionUpgradeException(“Switching to {0} will cause upgrade from {1} to {2}. Pass --upgrade to confirm”.format(branch, version_upgrade[1], version_upgrade[2]), version_upgrade[1], version_upgrade[2])
bench.app.MajorVersionUpgradeException: Switching to version-11 will cause upgrade from 9 to 11. Pass --upgrade to confirm