Updating oracle-8-minimal-tst

Error on updating oracle-8-minimal-tst: Command '['sudo', 'qubesctl', '--skip-dom0', '--targets=oracle-8-minimal-tst', '--show-output', 'state.sls', 'update.qubes-vm']' returned non-zero exit status 20.
oracle-8-minimal-tst:
      ----------
      _error:
          Failed to return clean data
      retcode:
          1
      stderr:
          Traceback (most recent call last):
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/loader/context.py", line 10, in <module>
              import _contextvars as contextvars
          ModuleNotFoundError: No module named '_contextvars'
          
          During handling of the above exception, another exception occurred:
          
          Traceback (most recent call last):
            File "/var/tmp/.root_dd8a91_salt/salt-call", line 27, in <module>
              salt_call()
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/scripts.py", line 435, in salt_call
              import salt.cli.call
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/cli/call.py", line 3, in <module>
              import salt.cli.caller
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/cli/caller.py", line 12, in <module>
              import salt.channel.client
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/channel/client.py", line 13, in <module>
              import salt.crypt
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/crypt.py", line 26, in <module>
              import salt.payload
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/payload.py", line 12, in <module>
              import salt.loader.context
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/loader/__init__.py", line 15, in <module>
              import salt.config
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/config/__init__.py", line 100, in <module>
              _DFLT_IPC_WBUFFER = int(_gather_buffer_space() * 0.5)
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/config/__init__.py", line 88, in _gather_buffer_space
              import salt.grains.core
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/grains/core.py", line 31, in <module>
              import salt.modules.cmdmod
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/modules/cmdmod.py", line 32, in <module>
              import salt.utils.templates
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/utils/templates.py", line 27, in <module>
              from salt.loader.context import NamedLoaderContext
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/loader/context.py", line 13, in <module>
              import contextvars
            File "/var/tmp/.root_dd8a91_salt/py3/contextvars.py", line 1, in <module>
              from _contextvars import Context, ContextVar, Token, copy_context
          ModuleNotFoundError: No module named '_contextvars'
          [ERROR   ] An un-handled exception was caught by Salt's global exception handler:
          ModuleNotFoundError: No module named '_contextvars'
          Traceback (most recent call last):
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/loader/context.py", line 10, in <module>
              import _contextvars as contextvars
          ModuleNotFoundError: No module named '_contextvars'
          
          During handling of the above exception, another exception occurred:
          
          Traceback (most recent call last):
            File "/var/tmp/.root_dd8a91_salt/salt-call", line 27, in <module>
              salt_call()
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/scripts.py", line 435, in salt_call
              import salt.cli.call
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/cli/call.py", line 3, in <module>
              import salt.cli.caller
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/cli/caller.py", line 12, in <module>
              import salt.channel.client
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/channel/client.py", line 13, in <module>
              import salt.crypt
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/crypt.py", line 26, in <module>
              import salt.payload
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/payload.py", line 12, in <module>
              import salt.loader.context
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/loader/__init__.py", line 15, in <module>
              import salt.config
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/config/__init__.py", line 100, in <module>
              _DFLT_IPC_WBUFFER = int(_gather_buffer_space() * 0.5)
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/config/__init__.py", line 88, in _gather_buffer_space
              import salt.grains.core
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/grains/core.py", line 31, in <module>
              import salt.modules.cmdmod
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/modules/cmdmod.py", line 32, in <module>
              import salt.utils.templates
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/utils/templates.py", line 27, in <module>
              from salt.loader.context import NamedLoaderContext
            File "/var/tmp/.root_dd8a91_salt/pyall/salt/loader/context.py", line 13, in <module>
              import contextvars
            File "/var/tmp/.root_dd8a91_salt/py3/contextvars.py", line 1, in <module>
              from _contextvars import Context, ContextVar, Token, copy_context
          ModuleNotFoundError: No module named '_contextvars'
      stdout: