# When I ran the snapcraft for the first time it ran perfectly and created the hello-world_2.1_amd64.snap but then I tried adding an 'apps' part and ran 'snapcraft prime' but it started to throw this error after that. From then on I tried removing everything from snap to multipass to snapcraft and created the same snap again but this error kept on propping.
# snapcraft.yaml file attached
ERROR LOG Below
Staging helloworld
Priming helloworld
/usr/lib/python3/dist-packages/snapcraft/internal/states/_state.py:96: YAMLLoadWarning: calling yaml.load() without Loader=... is deprecated, as the default Loader is unsafe. Please read https://msg.pyyaml.org/load for full details.
state = yaml.load(f.read())
Sorry, an error occurred in Snapcraft:
Traceback (most recent call last):
File "/usr/bin/snapcraft", line 9, in <module>
load_entry_point('snapcraft==2.43.1', 'console_scripts', 'snapcraft')()
File "/usr/lib/python3/dist-packages/click/core.py", line 716, in __call__
return self.main(*args, **kwargs)
File "/usr/lib/python3/dist-packages/click/core.py", line 696, in main
rv = self.invoke(ctx)
File "/usr/lib/python3/dist-packages/click/core.py", line 1037, in invoke
return Command.invoke(self, ctx)
File "/usr/lib/python3/dist-packages/click/core.py", line 889, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/usr/lib/python3/dist-packages/click/core.py", line 534, in invoke
return callback(*args, **kwargs)
File "/usr/lib/python3/dist-packages/click/decorators.py", line 17, in new_func
return f(get_current_context(), *args, **kwargs)
File "/usr/lib/python3/dist-packages/snapcraft/cli/_runner.py", line 93, in run
ctx.forward(lifecyclecli.commands["snap"])
File "/usr/lib/python3/dist-packages/click/core.py", line 552, in forward
return self.invoke(cmd, **kwargs)
File "/usr/lib/python3/dist-packages/click/core.py", line 534, in invoke
return callback(*args, **kwargs)
File "/usr/lib/python3/dist-packages/snapcraft/cli/lifecycle.py", line 136, in snap
project = _execute(steps.PRIME, parts=[], **kwargs)
File "/usr/lib/python3/dist-packages/snapcraft/cli/lifecycle.py", line 35, in _execute
lifecycle.execute(step, project_config, parts)
File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_runner.py", line 90, in execute
executor.run(step, part_names)
File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_runner.py", line 196, in run
self._create_meta(step, processed_part_names)
File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_runner.py", line 354, in _create_meta
common.env = self.config.snap_env()
File "/usr/lib/python3/dist-packages/snapcraft/internal/project_loader/_config.py", line 289, in snap_env
dependency_paths |= part.get_primed_dependency_paths()
File "/usr/lib/python3/dist-packages/snapcraft/internal/pluginhandler/__init__.py", line 885, in get_primed_dependency_paths
state = self.get_prime_state()
File "/usr/lib/python3/dist-packages/snapcraft/internal/pluginhandler/__init__.py", line 144, in get_prime_state
self._prime_state = cast(states.PrimeState, self.get_state(steps.PRIME))
File "/usr/lib/python3/dist-packages/snapcraft/internal/pluginhandler/__init__.py", line 148, in get_state
return states.get_state(self.plugin.statedir, step)
File "/usr/lib/python3/dist-packages/snapcraft/internal/states/_state.py", line 96, in get_state
state = yaml.load(f.read())
File "/usr/local/lib/python3.5/dist-packages/yaml/__init__.py", line 114, in load
return loader.get_single_data()
File "/usr/local/lib/python3.5/dist-packages/yaml/constructor.py", line 43, in get_single_data
return self.construct_document(node)
File "/usr/local/lib/python3.5/dist-packages/yaml/constructor.py", line 47, in construct_document
data = self.construct_object(node)
File "/usr/local/lib/python3.5/dist-packages/yaml/constructor.py", line 92, in construct_object
data = constructor(self, node)
File "/usr/local/lib/python3.5/dist-packages/yaml/constructor.py", line 420, in construct_undefined
node.start_mark)
yaml.constructor.ConstructorError: could not determine a constructor for the tag '!PrimeState'
in "<unicode string>", line 1, column 1:
!PrimeState
^
It seems the snapcraft version you are using was pip installed, we do not support that unless developing snapcraft itself, mind removing that install and instead `snap install snapcraft --classic` and trying again?