H2 Migration to postgres error: Target DB is already populated!

I followed the steps mentioned in the article to migrate from H2 to postgreSQL but I am getting the following error:

sudo java -jar metabase.jar load-from-h2 /home/azureuser/metabase.db # do not include .mv.db
Warning: protocol #'java-time.core/Amount is overwriting function abs
WARNING: abs already refers to: #'clojure.core/abs in namespace: java-time.core, being replaced by: #'java-time.core/abs
WARNING: abs already refers to: #'clojure.core/abs in namespace: java-time, being replaced by: #'java-time/abs
WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance.
2023-01-23 16:48:56,536 INFO metabase.util :: Maximum memory available to JVM: 982.0 MB
2023-01-23 16:49:06,702 WARN db.env :: WARNING: Using Metabase with an H2 application database is not recommended for production deployments. For production deployments, we highly recommend using Postgres, MySQL, or MariaDB instead. If you decide to continue to use H2, please be sure to back up the database file regularly. For more information, see Redirecting…
2023-01-23 16:49:13,258 INFO util.encryption :: Saved credentials encryption is DISABLED for this Metabase instance. :unlock:
For more information, see Redirecting…
WARNING: abs already refers to: #'clojure.core/abs in namespace: taoensso.encore, being replaced by: #'taoensso.encore/abs
WARNING: abs already refers to: #'clojure.core/abs in namespace: kixi.stats.math, being replaced by: #'kixi.stats.math/abs
WARNING: abs already refers to: #'clojure.core/abs in namespace: kixi.stats.test, being replaced by: #'kixi.stats.math/abs
WARNING: abs already refers to: #'clojure.core/abs in namespace: kixi.stats.distribution, being replaced by: #'kixi.stats.math/abs
2023-01-23 16:50:00,286 INFO driver.impl :: Registered abstract driver :sql :truck:
2023-01-23 16:50:00,317 INFO metabase.util :: ⮦ Load driver :sql took 901.2 ms
2023-01-23 16:50:00,408 INFO driver.impl :: Registered abstract driver :sql-jdbc (parents: [:sql]) :truck:
2023-01-23 16:50:00,447 INFO metabase.util :: Load driver :sql-jdbc took 1.0 s
2023-01-23 16:50:00,448 INFO driver.impl :: Registered driver :h2 (parents: [:sql-jdbc]) :truck:
2023-01-23 16:50:00,769 INFO driver.impl :: Registered driver :mysql (parents: [:sql-jdbc]) :truck:
2023-01-23 16:50:00,908 INFO driver.impl :: Registered driver :postgres (parents: [:sql-jdbc]) :truck:
2023-01-23 16:50:21,130 INFO metabase.core ::
Metabase v0.44.6 (5c6ae21 release-x.44.x)
Copyright © 2023 Metabase, Inc.
Metabase Enterprise Edition extensions are NOT PRESENT.
2023-01-23 16:50:21,742 INFO cmd.copy :: Set up h2 source database and run migrations...
2023-01-23 16:50:21,783 INFO db.setup :: Verifying h2 Database Connection ...
2023-01-23 16:50:32,102 INFO db.setup :: Successfully verified H2 1.4.197 (2018-03-18) application database connection. :white_check_mark:
2023-01-23 16:50:32,132 INFO db.setup :: Running Database Migrations...
2023-01-23 16:50:32,163 INFO db.setup :: Setting up Liquibase...
2023-01-23 16:50:41,278 INFO db.setup :: Liquibase is ready.
2023-01-23 16:50:41,279 INFO db.liquibase :: Checking if Database has unrun migrations...
2023-01-23 16:51:03,047 INFO db.setup :: Database Migrations Current ... :white_check_mark:
2023-01-23 16:51:03,107 INFO db.data-migrations :: Running all necessary data migrations, this may take a minute.
2023-01-23 16:51:03,357 INFO db.data-migrations :: Finished running data migrations.
2023-01-23 16:51:03,386 INFO metabase.util :: Database setup took 41.6 s
2023-01-23 16:51:03,387 INFO cmd.copy :: [OK]
2023-01-23 16:51:03,426 INFO cmd.copy :: Set up h2 target database and run migrations...
2023-01-23 16:51:03,426 INFO db.setup :: Verifying h2 Database Connection ...
2023-01-23 16:51:04,785 INFO db.setup :: Successfully verified H2 1.4.197 (2018-03-18) application database connection. :white_check_mark:
2023-01-23 16:51:04,856 INFO db.setup :: Running Database Migrations...
2023-01-23 16:51:04,926 INFO db.setup :: Setting up Liquibase...
2023-01-23 16:51:06,354 INFO db.setup :: Liquibase is ready.
2023-01-23 16:51:06,354 INFO db.liquibase :: Checking if Database has unrun migrations...
2023-01-23 16:51:18,342 INFO db.setup :: Database Migrations Current ... :white_check_mark:
2023-01-23 16:51:18,372 INFO metabase.util :: Database setup took 14.9 s
2023-01-23 16:51:18,381 INFO cmd.copy :: [OK]
2023-01-23 16:51:18,382 INFO cmd.copy :: Testing if target h2 database is already populated...
2023-01-23 16:51:18,441 ERROR cmd.copy :: [FAIL]
clojure.lang.ExceptionInfo: ERROR Testing if target h2 database is already populated...: Target DB is already populated! {}
at metabase.cmd.copy$do_step$fn__82850.invoke(copy.clj:67)
at metabase.cmd.copy$do_step.invokeStatic(copy.clj:63)
at metabase.cmd.copy$do_step.invoke(copy.clj:61)
at metabase.cmd.copy$fn__83004$copy_BANG___83009$fn__83010.invoke(copy.clj:347)
at metabase.cmd.copy$fn__83004$copy_BANG___83009.invoke(copy.clj:331)
at metabase.cmd.load_from_h2$load_from_h2_BANG_.invokeStatic(load_from_h2.clj:35)
at metabase.cmd.load_from_h2$load_from_h2_BANG_.invoke(load_from_h2.clj:25)
at clojure.lang.Var.invoke(Var.java:384)
at metabase.cmd$load_from_h2.invokeStatic(cmd.clj:45)
at metabase.cmd$load_from_h2.invoke(cmd.clj:39)
at clojure.lang.AFn.applyToHelper(AFn.java:154)
at clojure.lang.AFn.applyTo(AFn.java:144)
at clojure.core$apply.invokeStatic(core.clj:667)
at clojure.core$apply.invoke(core.clj:662)
at metabase.cmd$run_cmd$fn__83823.invoke(cmd.clj:227)
at metabase.cmd$run_cmd.invokeStatic(cmd.clj:227)
at metabase.cmd$run_cmd.invoke(cmd.clj:218)
at clojure.lang.Var.invoke(Var.java:388)
at metabase.core$run_cmd.invokeStatic(core.clj:167)
at metabase.core$run_cmd.invoke(core.clj:165)
at metabase.core$_main.invokeStatic(core.clj:189)
at metabase.core$_main.doInvoke(core.clj:184)
at clojure.lang.RestFn.applyTo(RestFn.java:137)
at metabase.core.main(Unknown Source)
Caused by: clojure.lang.ExceptionInfo: Target DB is already populated! {}
at metabase.cmd.copy$assert_db_empty.invokeStatic(copy.clj:201)
at metabase.cmd.copy$assert_db_empty.invoke(copy.clj:194)
at metabase.cmd.copy$fn__83004$copy_BANG___83009$fn__83010$fn__83015.invoke(copy.clj:348)
at metabase.cmd.copy$do_step$fn__82850.invoke(copy.clj:64)
... 23 more
Command failed with exception: ERROR Testing if target h2 database is already populated...: Target DB is already populated!

I checked the cloud db and found no tables associated with the metabase db. Can you please help?

metabase-> \dt+
Did not find any relations.

you don't seem to be starting metabase with this command though:

it seems you are moving form H2 to another H2