Hi, Can you try renaming existing pgAdmin4.db to pgAdmin4.db_OLD which is located at C:\Users\<YourUsername>\AppData\Roaming\pgAdmin\ And try to start pgAdmin4 again.
-- Regards, Murtuza Zabuawala EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company On Wed, Jun 6, 2018 at 9:48 PM, Igor Neyman <iney...@perceptron.com> wrote: > Hello, > > > > After installing PgAdmin 4 v.30 on Windows 10 when Trying to start it, I’m > getting “Fatal Error” message box: > > > > “The application server could not be contacted”. > > > > Here is the what’s in PgAdmin log file: > > > > Traceback (most recent call last): > > File "D:/Postgres/10/v3/web/pgAdmin4.py", line 70, in <module> > > app = create_app() > > File "D:\Postgres\10\v3\web\pgadmin\__init__.py", line 315, in > create_app > > db_upgrade(app) > > File "D:\Postgres\10\v3\web\pgadmin\setup\db_upgrade.py", line 25, in > db_upgrade > > flask_migrate.upgrade(migration_folder) > > File "D:/Postgres/10/v3/venv/Lib/site-packages\flask_migrate\__init__.py", > line 259, in upgrade > > command.upgrade(config, revision, sql=sql, tag=tag) > > File "D:/Postgres/10/v3/venv/Lib/site-packages\alembic\command.py", > line 254, in upgrade > > script.run_env() > > File "D:/Postgres/10/v3/venv/Lib/site-packages\alembic\script\base.py", > line 427, in run_env > > util.load_python_file(self.dir, 'env.py') > > File "D:/Postgres/10/v3/venv/Lib/site-packages\alembic\util\pyfiles.py", > line 81, in load_python_file > > module = load_module_py(module_id, path) > > File "D:/Postgres/10/v3/venv/Lib/site-packages\alembic\util\compat.py", > line 141, in load_module_py > > mod = imp.load_source(module_id, path, fp) > > File "D:\Postgres\10\v3\web\pgadmin\setup\..\..\migrations\env.py", > line 94, in <module> > > run_migrations_online() > > File "D:\Postgres\10\v3\web\pgadmin\setup\..\..\migrations\env.py", > line 87, in run_migrations_online > > context.run_migrations() > > File "<string>", line 8, in run_migrations > > File > "D:/Postgres/10/v3/venv/Lib/site-packages\alembic\runtime\environment.py", > line 836, in run_migrations > > self.get_context().run_migrations(**kw) > > File > "D:/Postgres/10/v3/venv/Lib/site-packages\alembic\runtime\migration.py", > line 321, in run_migrations > > for step in self._migrations_fn(heads, self): > > File "D:/Postgres/10/v3/venv/Lib/site-packages\alembic\command.py", > line 243, in upgrade > > return script._upgrade_revs(revision, rev) > > File "D:/Postgres/10/v3/venv/Lib/site-packages\alembic\script\base.py", > line 340, in _upgrade_revs > > for script in reversed(list(revs)) > > File "D:/Postgres/10/v3/venv\lib\contextlib.py", line 35, in __exit__ > > self.gen.throw(type, value, traceback) > > File "D:/Postgres/10/v3/venv/Lib/site-packages\alembic\script\base.py", > line 176, in _catch_revision_errors > > compat.raise_from_cause(util.CommandError(err.args[0])) > > File "D:/Postgres/10/v3/venv/Lib/site-packages\alembic\util\compat.py", > line 205, in raise_from_cause > > reraise(type(exception), exception, tb=exc_tb) > > File "D:/Postgres/10/v3/venv/Lib/site-packages\alembic\script\base.py", > line 143, in _catch_revision_errors > > yield > > File "D:/Postgres/10/v3/venv/Lib/site-packages\alembic\script\base.py", > line 336, in _upgrade_revs > > revs = list(revs) > > File "D:/Postgres/10/v3/venv/Lib/site-packages\alembic\script\revision.py", > line 698, in _iterate_revisions > > select_for_downgrade and requested_lowers > > File "D:/Postgres/10/v3/venv/Lib/site-packages\alembic\script\revision.py", > line 694, in <genexpr> > > rev.revision for rev > > File "D:/Postgres/10/v3/venv/Lib/site-packages\alembic\script\revision.py", > line 631, in _iterate_related_revisions > > ", ".join(r.revision for r in overlaps) > > alembic.util.exc.CommandError: Requested revision fdc58d9bd449 overlaps > with other requested revisions 02b9dccdcfcb > > Exception KeyError: KeyError(8304,) in <module 'threading' from > 'D:/Postgres/10/v3/venv\lib\threading.py'> ignored > > > > Regards, > > Igor Neyman > > > > >
