diff --git a/dvc/fs/hdfs.py b/dvc/fs/hdfs.py
index 4270ee1cbe..a1148753d3 100644
--- a/dvc/fs/hdfs.py
+++ b/dvc/fs/hdfs.py
@@ -229,7 +229,7 @@ def info(self, path_info):
 
     def checksum(self, path_info):
         return HashInfo(
-            "checksum",
+            HashName.CHECKSUM.value,
             _hadoop_fs_checksum(path_info),
             size=self.getsize(path_info),
         )
diff --git a/dvc/fs/memory.py b/dvc/fs/memory.py
index 84d672a408..1d11a17f97 100644
--- a/dvc/fs/memory.py
+++ b/dvc/fs/memory.py
@@ -15,7 +15,7 @@ def __init__(self, repo, config):
         self.fs = MemFS()
 
     def exists(self, path_info, use_dvcignore=True):
-        return self.fs.exists(path_info.path)
+        return self.fs.exists(path_info.fspath)
 
     def open(self, path_info, mode="r", encoding=None, **kwargs):
         return self.fs.open(
diff --git a/dvc/fs/webhdfs.py b/dvc/fs/webhdfs.py
index 4e698a4e5f..db123af6dc 100644
--- a/dvc/fs/webhdfs.py
+++ b/dvc/fs/webhdfs.py
@@ -127,7 +127,7 @@ def info(self, path_info):
 
     def checksum(self, path_info):
         return HashInfo(
-            HashName.CHECKSUM,
+            HashName.CHECKSUM.value,
             self.hdfs_client.checksum(path_info.path)["bytes"],
             size=self.hdfs_client.status(path_info.path)["length"],
         )
diff --git a/dvc/utils/serialize/_common.py b/dvc/utils/serialize/_common.py
index 8e1a7b77e2..157cdc1768 100644
--- a/dvc/utils/serialize/_common.py
+++ b/dvc/utils/serialize/_common.py
@@ -39,9 +39,10 @@ class ParseError(DvcException):
     """Errors while parsing files"""
 
     def __init__(self, path: "AnyPath", message: str):
+        from dvc.path_info import URLInfo
         from dvc.utils import relpath
 
-        path = relpath(path)
+        path = path if isinstance(path, URLInfo) else relpath(path)
         super().__init__(f"unable to read: '{path}', {message}")
 
 
diff --git a/tests/func/test_checkout.py b/tests/func/test_checkout.py
index b002955071..706eb212b8 100644
--- a/tests/func/test_checkout.py
+++ b/tests/func/test_checkout.py
@@ -312,8 +312,8 @@ def test(self):
 class TestCheckoutMissingMd5InStageFile(TestRepro):
     def test(self):
         d = load_yaml(self.file1_stage)
-        del d[Stage.PARAM_OUTS][0][LocalFileSystem.hash_name]
-        del d[Stage.PARAM_DEPS][0][LocalFileSystem.hash_name]
+        del d[Stage.PARAM_OUTS][0][LocalFileSystem._DEFAULT_HASH]
+        del d[Stage.PARAM_DEPS][0][LocalFileSystem._DEFAULT_HASH]
         dump_yaml(self.file1_stage, d)
 
         with pytest.raises(CheckoutError):
diff --git a/tests/func/test_data_cloud.py b/tests/func/test_data_cloud.py
index 2e5cef473d..5d304a1090 100644
--- a/tests/func/test_data_cloud.py
+++ b/tests/func/test_data_cloud.py
@@ -420,8 +420,8 @@ def test_pipeline_file_target_ops(tmp_dir, dvc, run_copy, local_remote):
 
     outs = ["foo", "bar", "lorem", "ipsum", "baz", "lorem2"]
 
-    # each one's a copy of other, hence 3
-    assert len(recurse_list_dir(path)) == 3
+    # each one's a copy of other, hence 3 (plus odb config file)
+    assert len(recurse_list_dir(path)) == 4
 
     clean(outs, dvc)
     assert set(dvc.pull(["dvc.yaml"])["added"]) == {"lorem2", "baz"}
@@ -434,11 +434,11 @@ def test_pipeline_file_target_ops(tmp_dir, dvc, run_copy, local_remote):
 
     clean(TmpDir(path).iterdir())
     dvc.push(["dvc.yaml:copy-ipsum-baz"])
-    assert len(recurse_list_dir(path)) == 1
+    assert len(recurse_list_dir(path)) == 2
 
     clean(TmpDir(path).iterdir())
     dvc.push(["dvc.yaml"])
-    assert len(recurse_list_dir(path)) == 2
+    assert len(recurse_list_dir(path)) == 3
 
     with pytest.raises(StageNotFound):
         dvc.push(["dvc.yaml:StageThatDoesNotExist"])
@@ -524,7 +524,7 @@ def test_push_pull_fetch_pipeline_stages(tmp_dir, dvc, run_copy, local_remote):
     run_copy("foo", "bar", no_commit=True, name="copy-foo-bar")
 
     dvc.push("copy-foo-bar")
-    assert len(recurse_list_dir(local_remote.url)) == 1
+    assert len(recurse_list_dir(local_remote.url)) == 2
     # pushing everything so as we can check pull/fetch only downloads
     # from specified targets
     dvc.push()
diff --git a/tests/func/test_repro.py b/tests/func/test_repro.py
index 7585ed406d..4e92e107d2 100644
--- a/tests/func/test_repro.py
+++ b/tests/func/test_repro.py
@@ -736,8 +736,8 @@ def test(self):
 class TestReproMissingMd5InStageFile(TestRepro):
     def test(self):
         d = load_yaml(self.file1_stage)
-        del d[Stage.PARAM_OUTS][0][LocalFileSystem.hash_name]
-        del d[Stage.PARAM_DEPS][0][LocalFileSystem.hash_name]
+        del d[Stage.PARAM_OUTS][0][LocalFileSystem._DEFAULT_HASH.value]
+        del d[Stage.PARAM_DEPS][0][LocalFileSystem._DEFAULT_HASH.value]
         dump_yaml(self.file1_stage, d)
 
         stages = self.dvc.reproduce(self.file1_stage)
diff --git a/tests/func/test_stage.py b/tests/func/test_stage.py
index df54c74ed1..1800756894 100644
--- a/tests/func/test_stage.py
+++ b/tests/func/test_stage.py
@@ -55,8 +55,8 @@ def test_empty_list():
 
 def test_list():
     lst = [
-        {LocalOutput.PARAM_PATH: "foo", LocalFileSystem.hash_name: "123"},
-        {LocalOutput.PARAM_PATH: "bar", LocalFileSystem.hash_name: None},
+        {LocalOutput.PARAM_PATH: "foo", LocalFileSystem._DEFAULT_HASH: "123"},
+        {LocalOutput.PARAM_PATH: "bar", LocalFileSystem._DEFAULT_HASH: None},
         {LocalOutput.PARAM_PATH: "baz"},
     ]
     d = {Stage.PARAM_DEPS: lst}