在Ambari 2.7.3中从HDF 3.1.0到3.3.0进行快速升级时，Nifi无法使用以下日志重新启动。即使将降级升级到3.1.0，Nifi仍然无法重新启动，并出现相同的错误。以下是安装过程中的错误。请让我知道如何解决此问题。非常感谢您的帮助
Traceback (most recent call last):
File "/var/lib/ambari-agent/cache/common-services/NIFI/1.0.0/package/scripts/nifi.py", line 304, in <module>
Master().execute()
File "/usr/lib/ambari-agent/lib/resource_management/libraries/script/script.py", line 352, in execute
method(env)
File "/usr/lib/ambari-agent/lib/resource_management/libraries/script/script.py", line 1006, in restart
self.start(env, upgrade_type=upgrade_type)
File "/var/lib/ambari-agent/cache/common-services/NIFI/1.0.0/package/scripts/nifi.py", line 143, in start
self.configure(env, is_starting = True)
File "/var/lib/ambari-agent/cache/common-services/NIFI/1.0.0/package/scripts/nifi.py", line 111, in configure
self.write_configurations(params, is_starting)
File "/var/lib/ambari-agent/cache/common-services/NIFI/1.0.0/package/scripts/nifi.py", line 231, in write_configurations
self.write_files(params)
File "/var/lib/ambari-agent/cache/common-services/NIFI/1.0.0/package/scripts/nifi.py", line 295, in write_files
boostrap_notification_content=config_utils.append_xml_content(params.nifi_boostrap_notification_content, params.nifi_boostrap_notification_dict)
File "/var/lib/ambari-agent/cache/common-services/NIFI/1.0.0/package/scripts/config_utils.py", line 27, in append_xml_content
original_config_root = ElementTree.fromstring(original_evaluated_config)
File "/usr/lib64/python2.7/xml/etree/ElementTree.py", line 1301, in XML
parser.feed(text)
File "/usr/lib64/python2.7/xml/etree/ElementTree.py", line 1643, in feed
self._raiseerror(v)
File "/usr/lib64/python2.7/xml/etree/ElementTree.py", line 1507, in _raiseerror
raise err
xml.etree.ElementTree.ParseError: not well-formed (invalid token): line 27, column 29