DDL unit tests made to fail by previous test (unknown)

Exception: lib/ddl/simpletest/testddl.php / ? ddl_test / ? testDeleteTablesFromXmldbFile
Unexpected exception of type [ddl_exception] with message [XML database file errors found] in [/fs2/www/html/sm449/coremoodle/lib/ddl/database_manager.php line 337]

Debug info:

Errors found in XMLDB file: XML Error: Opening and ending tag mismatch: secondtag line 0 and wrongtag at line 4.

• line 1290 of /lib/ddl/simpletest/testddl.php: call to database_manager->delete_tables_from_xmldb_file()
• line ... of ...

Exception: lib/ddl/simpletest/testddl.php / ? ddl_test / ? testInstallFromXmldbFile
Unexpected exception of type [ddl_exception] with message [XML database file errors found] in [/fs2/www/html/sm449/coremoodle/lib/ddl/database_manager.php line 390]

Debug info:

Errors found in XMLDB file: XML Error: Opening and ending tag mismatch: secondtag line 0 and wrongtag at line 4.

• line 406 of /lib/ddl/database_manager.php: call to database_manager->load_xmldb_file()
• line 1334 of /lib/ddl/simpletest/testddl.php: call to database_manager->install_from_xmldb_file()
• line ... of ...