We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Error with TransformationFactory('core.relax_integers')
When I use `TransformationFactory('core.relax_integrality').apply_to(m)`, a warning came up.

`WARNING: DEPRECATED: core.relax_integrality is deprecated.  Use core.relax_integers  (deprecated in TBD)`

When I changed the code to `TransformationFactory('core.relax_integers').apply_to(m)`, an error came up:

```
TransformationFactory('core.relax_integers').apply_to(m)
AttributeError: 'NoneType' object has no attribute 'apply_to'
```


Error with TransformationFactory('core.relax_integers')
When I use `TransformationFactory('core.relax_integrality').apply_to(m)`, a warning came up.

`WARNING: DEPRECATED: core.relax_integrality is deprecated.  Use core.relax_integers  (deprecated in TBD)`

When I changed the code to `TransformationFactory('core.relax_integers').apply_to(m)`, an error came up:

```
TransformationFactory('core.relax_integers').apply_to(m)
AttributeError: 'NoneType' object has no attribute 'apply_to'
```



--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `pyomo/core/plugins/transform/relax_integrality.py`
Content:
```
1 #  ___________________________________________________________________________
2 #
3 #  Pyomo: Python Optimization Modeling Objects
4 #  Copyright 2017 National Technology and Engineering Solutions of Sandia, LLC
5 #  Under the terms of Contract DE-NA0003525 with National Technology and
6 #  Engineering Solutions of Sandia, LLC, the U.S. Government retains certain
7 #  rights in this software.
8 #  This software is distributed under the 3-clause BSD License.
9 #  ___________________________________________________________________________
10 
11 from pyomo.common import deprecated
12 from pyomo.core.base import TransformationFactory
13 from pyomo.core.plugins.transform.discrete_vars import RelaxIntegerVars
14 
15 
16 @TransformationFactory.register(
17     'core.relax_integrality',
18     doc="[DEPRECATED] Create a model where integer variables are replaced with "
19     "real variables.")
20 class RelaxIntegrality(RelaxIntegerVars):
21     """
22     This plugin relaxes integrality in a Pyomo model.
23     """
24 
25     @deprecated(
26         "core.relax_integrality is deprecated.  Use core.relax_integers",
27         version='TBD')
28     def __init__(self, **kwds):
29         super(RelaxIntegrality, self).__init__(**kwds)
30
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/pyomo/core/plugins/transform/relax_integrality.py b/pyomo/core/plugins/transform/relax_integrality.py
--- a/pyomo/core/plugins/transform/relax_integrality.py
+++ b/pyomo/core/plugins/transform/relax_integrality.py
@@ -23,7 +23,7 @@
     """
 
     @deprecated(
-        "core.relax_integrality is deprecated.  Use core.relax_integers",
+        "core.relax_integrality is deprecated.  Use core.relax_integer_vars",
         version='TBD')
     def __init__(self, **kwds):
         super(RelaxIntegrality, self).__init__(**kwds)

{"golden_diff": "diff --git a/pyomo/core/plugins/transform/relax_integrality.py b/pyomo/core/plugins/transform/relax_integrality.py\n--- a/pyomo/core/plugins/transform/relax_integrality.py\n+++ b/pyomo/core/plugins/transform/relax_integrality.py\n@@ -23,7 +23,7 @@\n     \"\"\"\n \n     @deprecated(\n-        \"core.relax_integrality is deprecated.  Use core.relax_integers\",\n+        \"core.relax_integrality is deprecated.  Use core.relax_integer_vars\",\n         version='TBD')\n     def __init__(self, **kwds):\n         super(RelaxIntegrality, self).__init__(**kwds)\n", "issue": "Error with TransformationFactory('core.relax_integers')\nWhen I use `TransformationFactory('core.relax_integrality').apply_to(m)`, a warning came up.\r\n\r\n`WARNING: DEPRECATED: core.relax_integrality is deprecated.  Use core.relax_integers  (deprecated in TBD)`\r\n\r\nWhen I changed the code to `TransformationFactory('core.relax_integers').apply_to(m)`, an error came up:\r\n\r\n```\r\nTransformationFactory('core.relax_integers').apply_to(m)\r\nAttributeError: 'NoneType' object has no attribute 'apply_to'\r\n```\r\n\r\n\nError with TransformationFactory('core.relax_integers')\nWhen I use `TransformationFactory('core.relax_integrality').apply_to(m)`, a warning came up.\r\n\r\n`WARNING: DEPRECATED: core.relax_integrality is deprecated.  Use core.relax_integers  (deprecated in TBD)`\r\n\r\nWhen I changed the code to `TransformationFactory('core.relax_integers').apply_to(m)`, an error came up:\r\n\r\n```\r\nTransformationFactory('core.relax_integers').apply_to(m)\r\nAttributeError: 'NoneType' object has no attribute 'apply_to'\r\n```\r\n\r\n\n", "before_files": [{"content": "#  ___________________________________________________________________________\n#\n#  Pyomo: Python Optimization Modeling Objects\n#  Copyright 2017 National Technology and Engineering Solutions of Sandia, LLC\n#  Under the terms of Contract DE-NA0003525 with National Technology and\n#  Engineering Solutions of Sandia, LLC, the U.S. Government retains certain\n#  rights in this software.\n#  This software is distributed under the 3-clause BSD License.\n#  ___________________________________________________________________________\n\nfrom pyomo.common import deprecated\nfrom pyomo.core.base import TransformationFactory\nfrom pyomo.core.plugins.transform.discrete_vars import RelaxIntegerVars\n\n\n@TransformationFactory.register(\n    'core.relax_integrality',\n    doc=\"[DEPRECATED] Create a model where integer variables are replaced with \"\n    \"real variables.\")\nclass RelaxIntegrality(RelaxIntegerVars):\n    \"\"\"\n    This plugin relaxes integrality in a Pyomo model.\n    \"\"\"\n\n    @deprecated(\n        \"core.relax_integrality is deprecated.  Use core.relax_integers\",\n        version='TBD')\n    def __init__(self, **kwds):\n        super(RelaxIntegrality, self).__init__(**kwds)\n", "path": "pyomo/core/plugins/transform/relax_integrality.py"}], "after_files": [{"content": "#  ___________________________________________________________________________\n#\n#  Pyomo: Python Optimization Modeling Objects\n#  Copyright 2017 National Technology and Engineering Solutions of Sandia, LLC\n#  Under the terms of Contract DE-NA0003525 with National Technology and\n#  Engineering Solutions of Sandia, LLC, the U.S. Government retains certain\n#  rights in this software.\n#  This software is distributed under the 3-clause BSD License.\n#  ___________________________________________________________________________\n\nfrom pyomo.common import deprecated\nfrom pyomo.core.base import TransformationFactory\nfrom pyomo.core.plugins.transform.discrete_vars import RelaxIntegerVars\n\n\n@TransformationFactory.register(\n    'core.relax_integrality',\n    doc=\"[DEPRECATED] Create a model where integer variables are replaced with \"\n    \"real variables.\")\nclass RelaxIntegrality(RelaxIntegerVars):\n    \"\"\"\n    This plugin relaxes integrality in a Pyomo model.\n    \"\"\"\n\n    @deprecated(\n        \"core.relax_integrality is deprecated.  Use core.relax_integer_vars\",\n        version='TBD')\n    def __init__(self, **kwds):\n        super(RelaxIntegrality, self).__init__(**kwds)\n", "path": "pyomo/core/plugins/transform/relax_integrality.py"}]}